Fernandes struck United's second goal to close out the win.
He later said, "We needed to close the game. We knew we were very in control of the game but at any moment it can change.
"They had very good players up front that could make a big difference for them. To close the game then, we still could have got one or two goals but it is not easy against a low block, they were very compact and aggressive and defended very well even with 10 men."
On the confidence inside the team now, Fernandes also said: "When we win games the confidence goes higher and higher. It is very important for us to maintain the focus and not overdo it now. This is very good and very nice but we need to keep going.
"If you don't win the next one and the next one you will get back into the same place where you don't feel comfortable, you lose confidence and struggle to believe in everything you have been doing until now.
"But, we have been doing very well until now to do everything that Michael and the staff have been asking of us and we have been very brave taking responsibility in some moments in the game to go and play and do whatever you need to do to win the game.
"The main focus is the next game, it's four wins in a row, this one is nice, but we need to make it five now."