Andy Murray has all but ruled himself out of returning to singles in time for the US Open next month, after he marched into the Wimbledon mixed doubled third round with Serena Williams.
Former world No.1 Murray had originally targeted Flushing Meadows and the preceding events in North America for his singles comeback, but he has now said that is improbable.
"I think it's pretty unlikely just in terms of timing," he said. "I spoke to my team a bit about that on Monday.
"There's just a lot of stuff I need to get done physically, get myself stronger.
"The amount of work I need to do on the court to get ready for singles, the amount of work I need to put in off the court to get myself strong enough to play best-of-five sets; it's still quite a way away unfortunately... I want to make sure the operation I've had lasts for as long as possible."
The Scot is refusing to put a date on his return to singles play, but knows there is not enough time to be ready for the start of the US hard court swing in August.
"I can't give you an exact time frame because I don't know how long it's going to take for me to physically get to that level," he said.
"I know some people might like it to have taken five months or six months, but it's going to take more time than that, unfortunately."
Murray has been restricted to playing doubles during Wimbledon but he is doing a pretty good job as he looks like a title contender in the mixed with Williams.
The pair thrilled centre court with a 7-5 6-3 win over Fabrice Martin and Raquel Atawo to set up a meeting with top seeds Bruno Soares and Nicole Melichar.
However, pursuing doubles at the expense of getting ready for singles is not something Murray is ready to do.
"I want to try to prepare and get ready for singles... But, I don't know if I want to go over to the States to play doubles for four or five weeks.
"I'm not sure. I'm not sure yet.
"I'll decide on that probably when the tournament's done and sit down with my team."