Sir Alex Ferguson inspired the Manchester United players with a stirring speech to the dressing room over the Christmas period, according to the Sun.
Ferguson, who won 13 Premier League titles as United manager, was reportedly invited to speak to the players by current interim boss Ole Gunnar Solskjaer.
Solskjaer, who played under Ferguson at Old Trafford, is said to have brought the legendary coach in to rouse the players - and tell them they can make United great again.
A source quoted by the Sun said: 'He told the lads that this group will make United dominant and successful again.
'He said that he believes in them and he wants them to enjoy themselves and to fight hard for each other and leave everything on the pitch.
'He also told them that the club is in good hands and he promised them that it will become bigger and better in the years to come and they will be part of this success. The players believe that there are some good times ahead.'
Solskjaer has a close relationship with Ferguson after scoring the winner in the 1999 Champions League final, arguably the veteran manager's crowning triumph at United.
The address forms part of the Norwegian coach's attempt to improve the dressing room atmosphere, which was at rock bottom by the end of Jose Mourinho's spell in charge.
He has already improved results on the pitch, with Saturday's 2-0 FA Cup third round win over Reading ensuring Solskjaer has won each of his first five games as manager.
It also shows Ferguson, 77, is taking an active interest in United's fortunes again following his recovery from a brain hemorrhage last summer.