Ralf Rangnick's side slipped to a costly 1-0 defeat to Everton at the weekend and have only netted one goal in the last three games, Fred's equaliser against Leicester City at Old Trafford.
In addition to the home goalless draw with Watford, this has contributed to the team lying in seventh spot in the table and six points adrift of Tottenham Hotspur in fourth, despite our recent 3-2 victory over the north Londoners.
Berbatov, who shared the Golden Boot award with Manchester City's Carlos Tevez in 2010/11, is refusing to write off the Reds' chances of finishing in the top four, ahead of Norwich City's visit to Old Trafford this Saturday.