The flanker recently returned to full training following a shoulder injury that sidelined him for the entirety of last season.
He was players’ player and supporters’ player of the year in 2014/15, but an injury in a pre-season game at Wasps last October deprived him of a competitive outing last time round.
But Clark is now working his way towards a return and could get an outing in one of the upcoming Wanderers matches.
“He’s back in and you don’t get any half-hearted training sessions with Calum,” Mallinder said.
“When he’s in the opposition playing for the non-matchday 23, it’s always a dangerous prospect.
“It’s great to see him back out there, he’s looking fit and he’s clearly motivated as he always is.
“We’re looking forward to seeing him play.”