The Spaniard made 11 saves to United clinch a 1-0 away victory over Tottenham Hotspur.
"He was great like always," Matic said.
"We said in the changing room this is normal for us when we see David playing like this.
"It is very important to have him. He gives us confidence. He's saved us many times.
"I think everyone did very well but for me he was man-of-the-match."