Fabinho says Liverpool teammate Alisson is the Premier League's best goalkeeper.
The Brazilian's gaffe allowed Jesse Lingard to equalise during Liverpool's 3-1 victory over the Red Devils on Sunday.
But Fabinho has stuck by his compatriot.
"When we entered the locker room, we even talked, but I did not even focus on that," he added. "[Alisson] came to comment, but I said "no, bro, let it go".
"These plays will always happen. And what are we going to talk about Alisson? He was very important in our qualification for the last 16 of the Champions League, days before.
"Without a doubt, he is the best goalkeeper of the English League. There is a lot of confidence."