I think Potter got the formation wrong first half, but credit to him for changing it second half.
First half, looked like 4-1-4-1 to me, with Alzate DCM, Biss and Mwepu ahead of him, Solly wide right, Tross wide left.
Second half, we went to a back three with Gross RWB and Solly LWB, and Lallana...