The Manchester United manager has made it clear that he will not be pressured into picking players if he does not feel they should be in his team.
While they are securing game-time, between the league and Champions League the forwards have only started a combined total of 37 games.
The 22-year-old striker's current contract at Old Trafford is due to expire at the end of next season, although the Red Devils do have the option to extend by a further year.
In the 12 games since Sanchez made his debut in the FA Cup win over Yeovil on January 2, Rashford has started just twice.
"If I was you I would go in another direction", he said, speaking about Rashford ahead of United's match against West Bromwich Albion.
'It's just football, we can not have 11 players, it would be unbelievable economically for the football clubs to have only 11 and play with the same 11, no injuries, suspension, fatigue, it would be better for everyone to have only 11 but is not impossible, ' said Mourinho.
"If you want dry answers, I have dry answers. But we always want more and we always want to show progression individually and as a team, so the numbers don't really matter as much as the results do to me". "You always go to the one [who isn't playing]", Mourinho said.
Jose Mourinho has ruled out bringing in competition for Romelu Lukaku this summer, as he defended his selection policy at Manchester United.
"So at every club at every level, from the top of the world until the amateur football clubs you need more than 11 players and only 11 can start, it is as simple as that, there is nothing I can do".
The forward has played 97 matches as both a starter and a substitute since the Portuguese manager replaced Louis Van Gaal in August 2016. I am surprised because of the quality and experience of numerous players and the squad.
Mourinho told MUTV defenders Phil Jones, Marcos Rojo and Daley Blind are all available to return to the squad from their respective injuries for the visit of the Baggies.