Defender in Celtic talks
Celtic are hoping to sign RB Leipzig centre-back Marvin Compper for a fee in the region of £1m.
He also includes previous spells with Fiorentina, Hoffenheim and Borussia Monchengladbach.
The 32-year-old German was in Glasgow earlier this week and could join the Scottish champions during the January transfer window.
The Hoops already had problems at the back this season with Jozo Simunovic, Dedryck Boyata and Erik Sviatchenko all missing games through injury.