JAN KIRCHHOFF hopes the joke will be on his old boss Jurgen Klopp at Anfield today.
Sunderland’s £1million transfer-window recruit worked under the Liverpool manager — who he calls Kloppo — as a youngster at Mainz.
Former Bayern Munich defender Kirchhoff, 25, said: “He is a totally nice person and funny as hell.
“He is a good talker and puts a good mentality into his teams and a lot of intensity into his squads.
“As a player, you can see in two minutes that he has quality and he will be a good coach.