Honestly think Karius will be the No 1. Mignolet was given a contract to maintain his performance towards the second half of the season. You do not want your keeper to be wracked with doubts at any time. With Karius on board, if Mignolet leaves, we get a decent price for him.
I do however, question our keeper staff. Reina tailed off after Benitez left, Mignolet wasnt very good... just wondering if there isn't a massive improvement to be had there.