England flanker Michael Lipman will see a neurosurgeon on Tuesday amid fears about his immediate playing prospects.
Lipman has been sidelined since he was concussed during Bath’s Heineken Cup clash against Toulouse a month ago.
And the Bath captain admits he is “very concerned”.
Lipman’s plight comes just days after former France skipper Raphael Ibanez retired from playing with Guinness Premiership champions Wasps.
Ibanez, who led France 41 times during a 98-cap Test career, followed a neurosurgeon’s advice to step down. He suffered a head injury on three occasions earlier this season.
“I will be seeing a neurosurgeon in Bath on Tuesday,” said Lipman, who won the last of his 10 England caps against New Zealand in November.
“You can’t put a time limit on it, but you cannot play when you are not 100%.
“If you do so, you are risking brain damage, memory loss and the shakes. You have to look after yourself - I am only 29.”
Lipman was briefly knocked out in the Toulouse game following an accidental collision that saw him take a blow behind his left ear.
He had hoped to return in Bath’s Premiership clash with London Irish yesterday, and he was originally named in their starting line-up.
But he withdrew from the game on Friday after not feeling right during Bath’s final training run.
Bath head coach Steve Meehan said: “If there is the slightest doubt with this type of injury, you put the guy off for another week.
“I wouldn’t be happy for him to take the risk.
“And I wouldn’t be happy if he took the risk, and if he was to get another one (knock) and it finished his career.
“In the week, Michael trained, but at the end of the week he had the good sense to say he wasn’t right.
“He couldn’t describe exactly what was happening, but he wasn’t happy with the whole thing.
“He really is the sole judge. He’s the one who says ‘I’ve got through that training, I feel 100% and I am ready to take all my tests’.
“When he says that, and he passes everything, then I will be happy to put him on the field.
“He wants to play - he’s the captain of the side and he wants to be out there - but he needs to get the neurosurgeon’s clearance.”