The former Liverpool defender has played exactly two full games since March 2014 when cartilage damage ruled him out for more than a year.
After signing for Hoops in 2014, he was loaned out to Huddersfield where he got the bad injury.
Finally, back to a semblance of fitness he got his Rangers debut in a 2-1 win over Charlton in April last season only to suffer another setback.
False starts since, have brought furrowed brows that he will ever come good, but the Rs boss has no doubt.
“Robbo is a Liverpudlian, they're made of tough stuff,” he said.
“I love his enthusiasm, I think the kid in his first game for me was the best player.
“He was outstanding against Norwich. He's had a rough time since, but some people are like that. “Sometimes, the injury does flare up, as well as other things.
“I have no doubts that we'll get him over it, he'll learn to manage his own ailments and found a way to get more games under his belt as he's a fantastic player. He absolutely epitomize what I want as his football club.
“If you go through adversity you're going to be better."
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