The 21-year-old came to his side's rescue on the weekend as he set up two goals to level his side up in the draw at St Mary's.
But his night came to an abrupt end when he asked his boss to be subbed after picking up a slight injury in the game.
And Crooks, who believes Mourinho hooked off Rashford by his own accord, said the Portuguese is "killing" the forward.
Writing in his BBC Sport team of the week column, the pundit said: "This really can't go on. Jose Mourinho is killing Marcus Rashford.
"The lad pulled Manchester United from the jaws of defeat at Southampton and then Jose gave the one man who was desperate to win the game for him the hook? It made no sense."
The former Spurs and Man Utd player continued to say Mourinho is destroying his confidence.
He said: "The kid was on a roll and anyone who has played the game could see that. Mourinho may have won trophies but he destroys players in the process.
"He is doing to Rashford what he did to Arjen Robben at Chelsea. Rashford must get out of United now before what little confidence he has left is destroyed."
Crooks' clearly didn't see Mourinho's post-match conference where he revealed Rashford asked to come off.
But he is not alone in his feelings about the Manchester-born ace, as many believe he is not the same player for Man Utd as he is for England.
Even United superfan and United End editor Tom McDermott said it is unlikely he will achieve his full potential at Old Trafford.
And it has now come into question whether the 21-year-old would be better suited at a different club – with Juventus and Real Madrid interested in the starlet.
Rashford under Mourinho – has there been any improvement?
- 2016/17 – 11 goals and six assists in 53 appearances
- 2017/18 – 13 goals and nine assists in 51 appearances
- 2018/19 so far – two goals and three assists in 16 appearances
Judging by his stats there is a case for a move too – as he he has not improved his goal scoring ability significantly under Mourinho in three seasons.
In 2016/17 he scored 11 goals in 53 appearances.
This was only improved by two in the following season with 13 goals in 51 appearances.
His best tally doesn't look to be broken as he has only netted in two goals in his opening 16 appearances.
And fans seem to believe a move is best for the wide-man too.
One user wrote: "Rashford is regressing under this manager. His confidence is shot. If Jose stays, I wouldn’t blame if he pushed through a move."
While another wrote: "What a player Rashford is. He’s totally wasted at United, needs to move to a top club and play for a top manager"
Mourinho and Rashford are next in action against Arsenal on Wednesday at Old Trafford.
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