Although United remain in the Champions League and FA Cup, Matic acknowledged their inconsistencies have held them back from making a sustained assault on the title.
“We have to be honest and say we have had some very good games, but we have also had some bad games," said Matic.
“We have to improve together — we have the Champions League and the FA Cup still to play for. To win the league is going to be very hard, because the gap is very big, but we have to fight until the end and we will see what we can do.
“I think that we have improved. Of course, in the Premier League it's difficult to win every game, but I think, step-by-step, we've improved.
“In the future I believe, as a team, we can achieve big things together. I'm happy to be with the team and how we are working together. I'm sure we can do something this season and in the future."