The midfielder replaced Sergio Busquets early in the second half and set up Luis Suarez for the equaliser shortly afterwards.
Suarez went on to win the match with his second of the game late on, but Semedo picked out Vidal for praise after the match.
“We were strong enough to turn the result around,” he said.
“Arturo Vidal was really good, we’re used to the fight he gives and he was key in the team’s comeback.”
Source | Sport
The win means Barcelona join Borussia Dortmund at the top of Group F with four points from two games, next up in the competition are two games against Slavia Prague.