David de Gea believes the best is yet to come for him at Manchester United, after committing his long-term future to the club.
The goalkeeper signed a new contract earlier this week, that will keep him at Old Trafford until at least 2023.
Spanish international de Gea made some uncharacteristic mistakes last season but insists they weren't down to the contract situation being on his mind.
"I think people, when they look back on last season, they are thinking about the last few months," he told Sky Sports ahead of Sunday's match against West Ham.
"If you focus on the season as a whole and, in particular, the first seven months of that season I was quite happy with my form.
"You can say the contract is there in the background - it's not even in the back of your mind - that's put to one side. The day-to-day training, going out on the pitch, that's what you're focusing on - and helping the team, of course.
"Talking about the odd mistake, form can come and go with any player, but you are more under the microscope when you're a goalkeeper. It's not easy to keep up very high standards.
"I've been here for a number of years now and to be on top form all the time it's tough. There are moments when you feel better in yourself form-wise and moments where you're not quite so good. Mistakes happen, goalkeeper's live with them and I'm no different."