However, Klopp didn't play his full strength squad (only 2/3 of the players today started against Wolves), so exhaustion shouldn't be an issue.To the surprise of no one, running around full belt for 90 minutes every game results in burn out after Christmas, especially when the bulk of said players doing it are utterly average.
Simply, he once again disrespected the cup and his opposition by fielding a side full of kids and mediocrity and is now unhappy when he lost.