 On 30 November 1997, Thom picked up another winner's medal when he played in the Celtic side that defeated Dundee United 3–0 in the Scottish League Cup Final.Thom moved back to Germany in January 1998 to sign for Hertha BSC, although his 15 league appearances for Celtic earlier that season saw him pick up a Scottish League championship medal when Celtic clinched the league title in May 1998.Thom spent four years at Hertha BSC before retiring from playing.