Manchester United have been consistently linked to a move for the Champions League, Copa Libertadores and Club World Cup victor.
"If they'd got those wins they deserved they'd be challenging for the league", Ferguson concluded.
And Mourinho doesn't think his midfielder will shake off the injury before this weekend's game at Old Trafford.
United are now fifth in the Premier League table, 17 points behind leaders Chelsea.
United are into the last eight of the competition, where they will face Anderlecht, and they have a great chance of lifting the trophy. They've finished the 2016 fiscal year as the world's richest club.
And the most important thing about playing for Barca is that I'm making my childhood dream come true'.
They have not let in more than one goal in a match during their unbeaten run, conceding a total of 11 goals. He'll want to be up there trying to win the league. "It's not going to be easy to get into the top four", Ferguson added.
Meanwhile Manchester United manager Jose Mourinho says he is "totally against" worldwide friendlies following injuries to key central defenders Chris Smalling and Phil Jones on England duty.
While top four will indeed be a struggle, and a title won't be happening, at least Mourinho has silverware already- having beaten Southampton for the EFL Cup.
"It has to be one of those ways but I think, both ways, they will do it", the midfield great said.
Mourinho, 54, is in his first season as United boss and has already won the EFL Cup and is in the quarterfinals of the Europa League, but he has found it more hard in the Premier League with his side now sitting outside the top four. "And who knows, someday, I would like to play at it, yes", Daily Star quoted Neymar as saying.