The Red Devils are currently four points clear of defending English champions Manchester City at the top of the Premier League.
"We're in a good position but if we don't keep doing the right things we know what can happen," he told The Sun. "It's not a case of being more determined this time. We would be hungry to win the league regardless of what happened last year.
"We were hurting in the summer. It wasn't a nice thing that we went through on that last day. But it's gone now, we've got to focus on what is ahead of us.
"We know City are not going to go away but there are so many games left that if you spend too much time thinking about who is getting what result it can drive you mad. We just have to keep winning matches."
United are away at Tottenham Hotspur on Sunday.