Cole has struggled for first team action under the Scot.
Dalglish insisted: "Joe's goal wasn't a little contribution, it could be massive for him.
"He has not had as many opportunities as he'd have liked because of injuries and suspension.
"Joe has had a difficult time here, so great credit to him for the way he has been training and working every single day.
"He hasn't let that affect him and that's all I can ask for - when anyone gets their chance, to go and do their best.
"And to his great credit, he is fantastic in training. He plays everything right and there isn't a problem."