When Celtic won the 1967 European Cup, which was the only team to defeat them in the competition?

The 1967 European Cup Final was a football match between Italian team Inter Milan and Scottish team Celtic. It took place at the Estádio Nacional in Lisbon, Portugal on 25 May 1967 in front of a crowd of 45,000. Celtic won 2-1 with goals from Tommy Gemmell and Stevie Chalmers.

Celtic faced Yugoslavia (now Serbian) side Vojvodina Novi Sad in the quarter-finals, and lost the first leg 1–0 after a goal from Milan Stanić; this was Celtic's only defeat of the competition. The tie looked like it was going to end in a draw after Chalmers had given Celtic a 1–0 lead in the second leg. This would have resulted in the teams having to go to Rotterdam for a replay. However, in the 90th minute captain Billy McNeill scored to give Celtic the victory.