A run of poor performances from Loris Karius saw Jurgen Klopp turn to Mignolet. He's performed well since coming back into the team, avoiding the wrath of the Anfield faithful.
Signing Matip on a free transfer has proved a steal for Liverpool. The centre back has – when fit – improved the Reds defence and will need to be at his best for his first Merseyside derby, having missed the previous one this term through injury.
Lovren hasn't played since the end of January, enduring a spell on the sidelines with a knee injury, but he's said to have returned to full fitness.