But Frank Lampard won’t rush the Gilmour straight back into back into senior action, despite his outstanding breakthrough last season.
The Chelsea manager said: “He’s fit again he played Wednesday night and got good minutes and played well. I heard he played very and we were very happy with him and he will play again at the weekend for the under 23s.
“He’s fit, but he’s not match fit. That will be a short period, he’s a generally fit boy.”
Gilmour last played in July after making 13 appearances for the first team during last season.
He earned rave reviews in a short space of time, with Roy Keane declaring him “world class” after just one game.
Lampard already has plenty of options in midfield, which is why he allowed Ross Barkley and Ruben Loftus-Cheek to go out on loan this season.
He is convinced Gilmour is ready to challenge N’Golo Kante and Jorginho for regular action.
“He made great strides in a short time last year,” he said. “I was very confident putting Billy in for a big part of the season from his training. When the time came I possibly held him back sometimes looking back.
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“He unleashed himself and put in some really good performances before his injury. So we must put some context on it that he is still a young player.
“We have got competition in the squad in that area, but I’ve got absolute faith in Billy that he’s going to be a big player for us for a long time to come. So I’m really excited to have him back fit.”