Owen Farrell is making "encouraging" progress in his recovery from a back problem but Saracens are still unable to set a date for his return.
Farrell has yet to play this season because of the injury sustained during pre-season in a worrying development for England ahead of their autumn campaign, which opens against South Africa on November 12.
Place kicking is proving troublesome for the 25-year-old and his absence looks set to continue well beyond Sunday's Aviva Premiership showdown with Wasps.
"Owen trained on Thursday and trained as part of the opposition. That's a good, encouraging sign," Saracens director of rugby Mark McCall said.
"The scan he had last week came back positively, so that's good. It's really a case of when can Owen do all the things he needs to play. Once he can, he'll play.
"He hasn't placed kicked, but he's kicking out of hands. I'm not sure if he'll be fit for the Toulon match, but his ability to go straight back in would be a consideration.
"I'm nervous about saying too much about it because he's just done a 45-minute training session and looked pretty good, but it's how he feels over the next 24 hours that's the important thing."
England full-back Alex Goode will also sit out the visit of Wasps due to a knee problem.
"It's not bad, it's not an unstable knee, it's just badly swollen. Every time he plays it swells up again, so we need to settle it down with Toulon in mind," McCall said.