He told manutd.com: "At Ajax I was starting to feel like it was normal to win trophies and play in finals! But then it dried out and when I was at Fulham I thought it was the end of me winning things.
"Now I'm pleased to have a chance at United and perform on the highest level and achieve again those things I managed earlier in my career."
He added: "It's shaping up nicely but we haven't won anything yet.
"We can't relax - the last month is going to be the most important of the campaign, so everybody will have to keep focusing and working hard and hopefully the rewards will come after that."