Andy Murray will make a final decision on Tuesday as to whether he is fit enough to play in the Wimbledon singles later that day.
The 37-year-old Briton, who had a cyst on his back removed nine days ago, is scheduled to play Tomas Machac of the Czech Republic at about 18:30 BST.
Murray is giving himself as long as possible to be ready to play in what will be his Wimbledon farewell.
The two-time champion is planning to retire later this year.
If he is not fit enough for one final appearance in the singles, Murray could still play in the doubles alongside older brother Jamie later this week.
Speaking after practice earlier on Monday, Murray said: “I’ll have a chat with my team, speak to my family this evening and make a decision.
“It’s getting better and the testing I’ve done has been good. I just need to decide whether it’s enough to compete.”
Murray is fighting to be fit because he wants a bit of “closure” at the All England Club before stopping playing professionally.
The former world number one had the cyst close to his spinal cord removed because it was causing nerve pain in his right leg.
On Sunday, Murray said the area where he had the operation was not sore, but added he still did not have 100% feeling in his leg.
He trained with former British number one Kyle Edmund for over an hour on Monday, leading 6-3 2-0 in a practice match before they stopped.