The Manchester United captain, who confirmed in the pre-match press conference that he has rejected an approach from Al-Hilal in Saudi Arabia, played a part in the move that led to the winning goal, scored by former Reds star Cristiano Ronaldo.
The hosts had taken the lead in the semi-final, through Florian Wirtz's header, with referee Slavko Vincic deciding not to rule it out after being advised to go to the monitor by VAR.
Francisco Conceicao's brilliant solo effort soon levelled matters, in any case, before Ronaldo finished off a fine assist by Nuno Mendes.
Referee Slavko Vincic allowed Germany's goal, despite going to the monitor.