Vilanova was head coach at Barcelona and a respected figure in Spanish football but sadly lost his fight with cancer this week, and his countrymen wanted to make a gesture.
After the game, in which Juan scored two goals, he said: "It was for Tito Vilanova. It has been a difficult week and this was the saddest news for every person that loves football.
“He was very important at Barcelona and in Spanish football in general. I feel very sad and I wanted to give my support to his friends and family.”
After the news broke, David De Gea paid tribute on his Twitter account, writing: “A very sad day. Tito Vilanova has left us but his fighting remains as an example. RIP. Great hug to all his family.”
United’s Twitter account, @ManUtd, followed with the message: "#mufc is saddened to hear that Tito Vilanova has passed away. We extend sincere condolences to his family and our friends at @FCBarcelona."