Former captain Gary Neville says that, as a fan, he would be happy to see the 25-year-old leave if his focus was not on United, but Mourinho says the World Cup victor has not told him that he wants to go.
The former Reds defender believes that Rashford could benefit from a move away from Manchester United to establish himself as a central striker.
Didn't have a lot of time to make a mark in the game. And I told the players at half-time - sometimes I am sorry we don't have a camera in the dressing room because I told them what exactly happened - that it could be a match to win four or five nil, or to be in real trouble.
When asked if he believes Rashford has earned more playing time after scoring twice for England over the global break, Mourinho gave a sarcastic response, making his feelings towards the media well known.
During a press conference Friday, Mourinho argued that Rashford has played 5,744 minutes in 105 games in all competitions over the past two seasons for the club, and suggested that the player was getting more game time than other young English rival.
The Hornets have won their opening four league games, but Mourinho will be hoping to see his men repeat the performance they put in last season at Vicarage Road when they won 4-2.
Pogba was routinely dropped by Mourinho last season, but, despite being an ever-present this campaign, has hinted his relationship with the United manager remains strained. "Speaking about Marcus, I think I can expect that Sunday I'm going to be highly criticised for not playing him", he said. Marcus Rashford is not Dominic Solanke, not Ruben Loftus-Cheek, not Dominic Calvert-Lewin.More news: Hurricane Florence Drowned a Riverfront 30 Miles from the North Carolina Coast
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Pogba could have scored a couple of goals in the first half but he didn't play the same way in the second half. The only thing that is clear for me is that the player never - never in all these days we are together - never told me that he wants to leave.
"Some of the persons, everybody knows they have double salaries, they work also for the clubs and when they work also for the clubs they are not independent and they conduct things in the direction they want, that's obvious".
"Since I was here, he was never one day out for selection because of my decision, only if injured or suspended".
On his team's overall display at Watford, Mourinho added: 'Very important.
"My future is now in Manchester, I still have a contract, I'm playing there at the moment, but who knows what will happen in the next few months".