Great Britain captain Jeremy Bates will discover today if Andy Murray is fit to play in the Davis Cup this weekend.
Bates is anxiously awaiting the results of a blood test on Britain's No 1 ahead of the Euro-African zone tie against Serbia and Montenegro in the Braehead Arena, Glasgow starting on Friday.
Murray has been suffering from a fever and swollen glands, as well as nursing an ankle injury which he sustained while losing in the first round of the Nasdaq-100 Open in Miami, Florida.
Bates said: "We are just waiting on the results from the tests, I've been told will get the results on Wednesday morning.
"He hasn't played, so I couldn't tell you if the ankle is fine. He has been in bed since Sunday morning, although he is not in bed any longer, but he hasn't played on his ankle. It is more about his health as opposed to the ankle.
"I can change the team up to an hour before Thursday's draw but I don't want the opposition knowing what players we have and haven't got available."
If Murray cannot make it, there will be no recall for former British No 1 Tim Henman, who retired from the Davis Cup scene last year. Bates added: "I've had plenty of chats with Tim about the Davis Cup and he has stated his feelings on it and I respect that."
Murray has risen from 400th in the world to 41st in the past 12 months and recently won his first ATP tournament event in San Jose, California and Bates predicts his star will continue to rise.
He said: "A year ago he was 400th and now he's 41st. That's been a meteoric rise, by anyone's standards.
"He has made his breakthrough and established himself in the top 50 but, in terms of where he can be, he can be one of the best players in the world.
"Things are going very quickly and he deserves everyone's support, as that could make the difference."
The Davis Cup event, which will be staged over three days at Braehead, is already a sellout and Bates is looking forward to his team playing their first home match in four years on Scottish soil.
He said: "The whole arena is always how I envisaged Davis Cup being. Very intimate and steep sides, with the people very close to the courts.
"The tickets sold out in about two hours, which says a lot. We haven't played at home since 2002, so to play at home is a boost. To play in front of 4,000 fans who are on our side is very special."