France international Martial is enduring a difficult season, having scored just seven goals in 40 appearances and two in the last two months.
The 25-year-old’s form has frustrated supporters, especially as Martial enjoyed his best campaign to date in 2019-20, netting 23 times in all competitions.
Souness says it is now clear that Manchester United ‘cannot rely’ on Martial and has questioned whether he has a future at Old Trafford.
‘Anthony Martial has had his chance at United now,’ Souness told The Times.
‘The bottom line is you can’t trust him, you don’t know what you’re getting from him and at a big club like United you cannot have that with your No 9.
‘I said at the start of the season that Ole Gunnar Solskjaer had to find a way of keeping him on his toes. He finished well last season, but they cannot rely on him.
‘At United, you have to be at it every week, not picking games or moments in games when you fancy it. You’re not describing a big player if you say that.
‘Even his biggest fan would agree Martial is not at it every week, showing he’s up for the fight with his team-mates.
‘A player with his ability should be saying to himself, “I’m going to be the difference, I’m going to win this game single-handedly.”
‘Instead, he sometimes looks like he would rather be at home watching Coronation Street.’
Former Manchester United striker Louis Saha would appear to disagree with Souness as he says ‘top player’ Martial should stay at Old Trafford.
Speaking to talkSPORT this weekend, Saha said: ‘I really don’t think he’s a player Man United should let go because he can be that player who completes the striking force as he’s unique in the way he plays.
‘I think he’s a top player, that’s for sure. I think when you’re a No. 9 and you’re not scoring, it’s difficult as people are only asking you to score goals. That’s it.
‘When you’re not doing it you’re going to be criticised. You need to be strong and really believe. You also need to be selfish and adopt a style of play that you really fancy.
‘This is why he’s getting the criticism. It’s not about his talent or desire because he has that I’m sure.’
Solskjaer’s Manchester United, currently third in the Premier League, face leaders Man City on Sunday afternoon.
For more stories like this, check our sport page.