Clarke paid tribute to Long after another fine performance following the death this week of his grandmother.
He displayed a T-shirt which said 'Rest In Peace Gran' after scoring his sixth goal of the campaign.
Clarke said: "I've run out of words to describe his performances this season.
"Shane produced another fantastic performance in what has been a difficult week for him.
"He wanted to play. He is going back to Ireland tonight to be with his family for the next two or three days."