Former Manchester United captain Bryan Robson fears veteran midfielder Paul Scholes may be forced to retire at the end of the season.
While 39-year-old team-mate Ryan Giggs has recently penned a one-year deal to extend his Old Trafford career into its 23rd season, Scholes has been hampered by knee issues recently.
Robson said: "Giggsy has got another year, but he looks as fit as he was when he was 21. Scholesy I'm not so sure about. He's been having a few problems with his knee. So I think he might just call it a day."
The former England midfielder - a year younger than Giggs - retired from the game in May 2011 but reversed his decision within six months.
Robson added: "Only he can answer whether or not he may register again in case of emergencies.
"But because of his attitude and the way he goes about training it is good to have him around the place."