The 'Reds' defensive midfielder, 22-year-old Stewart was recalled from a spell at Swindon Town in January and has since played in five games for Liverpool.
He was injured during a training session, Klopp reported on the incident to 'Goal' reporters, "Yesterday we lost Kevin Stewart in training. He blocked a shot and his ankle was not stable, I think it's a little bit of a ligament and at the moment, it's swollen. We have sent him for a scan."