As many have mentioned, he's a deep lying holding midfielder who's job is to win back possession and play it to others who have the responsibility and attributes to do that. Unfortunately he had nothing to play too. Ejaria went sideways or passed back to McAuley 99% of the time and Coulibaly looks aimless in possession.
Ryan Jack as the senior player in midfield last night should have been going back and taking the ball from then centre backs and building play. He shirked that many times sadly. The midfield trio were awful last night.