Writing in his column for the Mirror, Collymore is adamant that the current Premier League champions will struggle in Europe this season and rivals Liverpool and Manchester United are better equipped for the knockout rounds.
However, he will have to begin that journey without one of his favourite stars, Marouane Fellaini.
"He's a very important player for me - much more important than you can imagine", Mourinho said on Monday.
"It doesn't matter that he hasn't played Champions League before, he has scored goals and played in the best league in the world so he will score goals for us".
"For a club like Manchester United not to be in those games it was hard", The Mirror quotes De Gea as saying. But if for the first time Manchester United won 1: 3 and played a 1: 1 draw, then in the last, the home match also ended in a draw, but already 3: 3, and in Switzerland 2: 1 lost.
And they will debut this Tuesday against FC Basel at Old Trafford, one of the most magical venues when it comes to European miracles. If they get their tails up and start to get that belief they've had in the Premier League for the past couple of years they can certainly go very close.
"The Champions League night is a unique experience for everyone".
Due to finishing third in the Premier League last season, Manchester City was able to qualify straight for the Champions League, where they have been dealt a relatively favorable group. The teams played to a 1-1 draw in the second group stage on March 12, 2003, and to a 3-3 draw -- in which Ashley Young scored the equaliser in the 90th minute - in the group stage on September 27, 2011.
With Paul Pogba, aged 24, behind him in midfield, United believe they have built the foundations of a winning future, but Rashford is the jewel in the crown at Old Trafford and Europe will be eagerly anticipating his debut on the Champions League stage.
Basel have never progressed further than the last 16 in the Champions League (2011-12, 2014-15). Liverpool's attack will give most European sides problems, but their defence is likely to let them down against those same sides.
Unlike his counterpart in the Manchester United dugout, Raphael Wicky has no personnel availability issues on his hands whatsoever, with no injury concerns or suspensions. Players such as Ricky van Wolfswinkel should ring a bell with Premier League fans, and the team has a solid academy that regularly produces good prospects. His best performance was in 2012-13 when he reached the quarter-finals with Juventus.
- Ernesto Valverde is taking charge of a fourth club in the Champions League after Olympiakos, Valencia and Athletic Bilbao.