The Bulgarian star joined United in the summer from Tottenham and is yet to win a Premier League title with the club.
“The players here who have already won it, need it again and again and again,” he said.
“I have none of that. When I am here, it is like I need it – I want it.
“With the help of everybody, with the right amount of effort on the pitch and with the team we have, I am pretty sure we can win it again.”