The German defender left the Hoops this month following an ill-fated 18-month Parkhead spell.
Celtic have failed to acknowledged Marvin Compper's departure.
Christopher Jullien, Boli Mbombo and Luca Connell have signed for Scottish Premiership champions Celtic with Youssouf Mulumbu and Marvin Compper gone.
Celtic have let Marvin Compper leave the club for Duisburg.
Marvin Compper appears to have left Celtic with cult-hero status after making just one appearance in 19 months.
The curious case of Celtic centre-back Marvin Compper.
In a world of 25-man squads but still only 11 starting berths out on the pitch, it’s inevitable that some players are going to struggle for game time. Balancing a squad and keeping everyone happy is actually one of the most difficult aspects of modern football management, and we see footballers seeking out pastures new when they aren’t getting enough minutes out on the pitch every transfer window.
Marvin Compper was given a winner's medal for Celtic today.
Celtic boss Neil Lennon is short on central defense options.
The mysterious Celtic defender popped up with a goal for the reserves today.
Arsenal boss Unai Emery gave Reiss Nelson a chance to impress last night.
Arsenal youngster scored in win over Nottingham Forest.
The Liverpool winger is out of action with a calf injury.
Pedro Chirivella is in line to feature for Premier League leaders Liverpool in the EFL Cup clash at MK Dons, alongside Harvey Elliott and Rhian Brewster.
Arsenal defender David Luiz could come back into Unai Emery's side on Monday evening.
Tottenham Hotspur boss Mauricio Pochettino is reportedly set to recall Eric Dier to his first-team.
Rangers appear to have brought Krystof Hampl to Ibrox.
Celtic are not allowed to play Greg Taylor in the League Cup tomorrow night.
Leeds United were handed the FIFA Fair Play Award for their actions during a match with Aston Villa last season.
The 23-year-old has scored 13 times for Ibrox side Glasgow Rangers this season.