Walsh looked like he was limping after his part in last week’s victory over Widnes had ended, but Cunningham explained that fans did not need to worry.
“Luke got a bit of a knock on his leg,” he said.
“He actually got a full contact collision, which you do in rugby league, and I think memories were cast back to when he initially did it.
“Which is going to happen, and it’s going to happen in the weeks to come. There’ll be times when he gets bumps.
“But what’ll happen is that his brain will tell him, ‘Everything’s fine, it’s nothing serious and I can just carry on.’
“It happens with anybody who gets involved in such a big trauma like Luke went through.
“He came through, and he was a bit bumped and bruised, and his leg was a bit sore, but he’s trained.
“He was a little bit sore early on in training, but got through really good and looked really sharp.
“He just goes and runs as normal in the captain’s run on Thursday, and then plays on Friday.”
Cunningham also paid tribute to the club’s medical staff, who have had to work hard in recent weeks to get key men back into action.
“You’ve got to give credit to the medical staff,” he said.
“In the past few weeks we’ve brought some key people back, and those key people have stayed back.
“It means that your medical staff are doing the right thing behind the scenes, and you’ve got to give them credit for that.”