England captain Dylan Hartley could sit out the rest of the season as Northampton take a cautious approach with his concussion.
Hartley was concussed playing for England against France on March 19 and has been ruled out of Saints' meeting with Wasps this weekend.
Northampton boss Jim Mallinder does expect Hartley to play a role in his side's Premiership and European run-in, but also admits the club are prepared to sit him out just as they did with Wales wing George North last season.
Hartley admitted in the aftermath of England's Grand Slam win that he couldn't remember lifting the trophy, having been stretchered from the field before full-time.
"You don't know with these things and sometimes they can go on," Mallinder told The Times.
"You've got to be very careful.
"We had this issue with George North this time last year, we'd have loved to get him back for the big games, the semi-finals and finals, but he just wasn't right.
"We're more hopeful with Dylan. We're hoping and expecting him to play again for us this season."