Novak Djokovic confirmed on Wednesday that he's optimistic of starting for Serbia against Kazakhstan on Friday in their Davis Cup World Group first-round tie after dealing with an infection in both eyes.

The world number one developed the problems last week in Dubai, where he was forced to quit his quarter-final against Feliciano Lopez.

Reports indicated that he could have picked up his case of conjunctivitis during a photo shoot in a water park swimming pool 10 days ago.

"All is going well regarding my recovery and I am optimistic about playing in the tie," Djokovic said. "I was very skeptical about playing at first, but I still have two days left to adapt to the light and other indoor conditions and hopefully I will be OK."

Serbia are keen to try and repeat history after winning the worldwide team competition in 2010, with Djokovic leading the effort.

Meanwhile, the fitness of Dubai semi-finalist Nick Kyrgios was becoming more of a mystery after the Australian made a brief appearance on court at Kooyong club this week in the run-up to their tie with the United States.

Kyrgios came down with a virus in Dubai and was unable to complete his semi-final against Stan Wawrinka. He hit for 30 minutes in Melbourne this week but is no sure thing for a start on Friday.

There is now serious speculation that just-retired Lleyton Hewitt, 35, could step into a playing captain's role for the tie.

Any unscheduled return for Hewitt would place the two-time grand slam winner alongside Bernard Tomic (dealing with a wrist niggle) in singles against the 32-times champion US with John Isner, Jack Sock and the Bryan twins.

"We'll have to see now, but he hit really well and he seems good," team coach Jason Stoltenberg said of Kyrgios, who has been quarantined away from the team under Hewitt's orders.

"(Hewitt's) enjoyed the hitting, though. He thought he was retired and he's hitting more than these guys. It's probably the first time a captain's had to get out and prepare as if he may play," the coach told The Age.

"He's a great team man and he'll do whatever he needs to do, whether that's playing or sitting on the side. We don't expect he'll play. But we'll have to wait and see in the next 24 hours. He thinks ahead and he's pretty organised. So I'd say in his mind he's just covering all his bases."

Related stories

Latest news

Syrian opposition rules out future role for President al-Assad

The Syrian opposition said Friday it would not accept any role for President Bashar al-Assad in the future of the war-torn country, reacting to a recent US shift saying that removing al-Assad is no longer a priority for Washington.

Russian Army integrates breakaway forces of Georgian province

Parts of the small fighting forces of the Georgian breakaway province of South Ossetia have been placed under Russian military control, Russian Defence Minister Sergei Shoigu said on Friday.

Czech Republic's Pilsner Urquell beer is now Japanese

Japanese brewing company Asahi completed its takeover of the Czech brewery Pilsner Urquell on Friday, Asahi said in a statement.

Judge approves 25-million-dollar settlement of Trump University case

A US district judge on Friday approved a 25-million-dollar settlement of lawsuits and state fraud allegations against Trump University, the US president's now-defunct business venture.

Former Thai premier Thaksin to junta on reconciliation: 'Cut me out'

Former Thai prime minister Thaksin Shinawatra on Friday announced that he is not interested in the junta-led reconciliation process, three days after the junta handed him a half-a-billion-dollar tax bill for his past business deal.

Dalic: We welcome possible deal between Agrokor and banks

The government welcomes the possibility of an agreement being concluded between the Agrokor food company and creditor banks, and the bill on vitally important companies is not a fallback plan but the result of the government's care for the overall economic and financial stability of Croatia, Deputy Prime Minister and Minister of Economy Martina Dalic told a press conference in Zagreb on Friday.

Croatia, China sign action plan for cooperation in agriculture

The Croatian and Chinese ministries of agriculture on Friday signed an action plan for cooperation in the field of agriculture for the period 2017-2018, the Croatian ministry said in a statement.

ZSE indices up, Agrokor shares in focus of investor interest

The Zagreb Stock Exchange (ZSE) indices on Friday rose by more than 1.8%, with stocks of the Agrokor food and retail concern being in the focus of investor interest again.

Berlin police defend handling of Berlin market attacker

Berlin police defended themselves on Friday against accusations that they stopped surveillance on Berlin Christmas market attacker despite knowing in June 2016 he was dangerous.

Croatia, creditors tailor emergency measures to save tottering giant

Croatia's tottering retail and food giant Agrokor reached an agreement with its creditors, putting its debts standby and allowing it to continue working during emergency restructuring, the Croatian branch of Austria's Erste Bank said Friday.

Agrokor's creditors say standstill agreement to go into force today

A standstill agreement regarding the Agrokor concern's existing financial obligations to banks will take effect on Friday, additional capital will be injected into the concern in the coming days and the concern will be actively restructured, which includes a change of its management, it was said on Friday after a meeting between Agrokor's suppliers and creditor banks.

Palestinians, UN slam Israel's new settlement plan

Palestinians, Israeli activists and the UN lambasted the government of Israeli Prime Minister Benjamin Netanyahu on Friday, a day after it gave the go-ahead for the first new West Bank settlement in a quarter of a century.

South Sudan rebels release three abducted foreign oil workers

South Sudanese rebels have released three foreign engineers they abducted in early March in the oil-rich Upper Nile region, Foreign Affairs Ministry official Mawein Makol Arik said on Friday.

Turkish opposition: Imprisoned party chief has gone on hunger strike

The head of Turkey's pro-Kurdish opposition party has launched a hunger strike from prison.

European leagues threaten Champions League schedule clashes

The European Professional Football Leagues (EPFL) on Friday threatened schedule clashes on Champions League matchdays in an ongoing dispute with the governing body UEFA.

Danish court revokes citizenship of IS volunteer

A Danish appellate court on Friday stripped a man of his Danish citizenship for volunteering to fight for the extremist Islamic State in Syria.

Banks and Agrokor agree on key elements of standstill agreement

Member banks of the coordinating committee of financial creditors and representatives of the Agrokor food company have in principle agreed on key elements of a standstill agreement, which is expected to be signed later today, announcing changes in the company's management team, Erste Bank said in a statement on Friday afternoon.

Syrian man on trial in Sweden; mosque attack labelled terrorism

A Syrian man went on trial Friday in the southern Swedish city of Malmo, charged with terrorism and arson after an attack last year on a building used as an assembly hall by Shiite Muslims.