Zidane will be high on United's wishlist for a new manager if they do give Mourinho the boot this season following their rocky start and lacklustre transfer window.
Southgate told reporters: "The only way for him to improve is by playing".
Less than 24 hours earlier, however, the 25-year-old had also spoken about the same issue, claiming: "I'm playing there [United] at the moment, but who knows what will happen in the near future?"
He continued: "You are then judged as much on those fleeting chances as the ones you score".
Mourinho failed to get his way on Martial or the defender, so don't expect him to come out on top in the Pogba situation.
More likely than a suggestion he may need to move away from United, Southgate's comments are simply a plea for critics not to be overly harsh on Rashford and a reminder that he is still in the early days of his career.More news: Call of Duty: Black Ops 4 Blackout Gets First Adrenaline-Fueled Trailer
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Mourinho has never been known for an entertaining brand of football, and Cantona believes his former side are suffering as a result.
He also suspects Alexis Sanchez would be next in line to occupy United's centre-forward position if, for whatever reason, Lukaku was unavailable.
"And would Mourinho really turn to Rashford if he needed another striker?"
Club chiefs want someone to work within United's scouting and recruitment department to analyse the performance of potential scouting targets in specific countries and regions.