Alexis Sanchez to be in Manchester United squad vs. Yeovil - Mourinho

MANCHESTER -- Jose Mourinho has confirmed new Manchester United signing Alexis Sanchez will feature against Yeovil Town in the FA Cup fourth round on Friday night.

Mourinho has warned his stars they must "perform" to keep their places in the wake of Sanchez's arrival.

Sanchez is set to make his debut against Yeovil at Huish Park, providing the first opportunity to see where he fits into a forward line that already includes Romelu Lukaku, Juan Mata, Anthony Martial, Marcus Rashford and Jesse Lingard.

And Mourinho accepts the pressure is on some of his players.

He told a news conference on Thursday: "This is life in big clubs. In big clubs you have big players, you have competition, you have responsibilities, you have to perform always. The players in big clubs know the squad is 20 something where everybody wants to play.

"I think is absolutely fundamental and we want to improve all the time, do better and better and better. We want to achieve big things and will not stop until we do that. We want to be fighting for titles and so it is a very, very important addition for us.

"Now we have five attacking players of high quality -- Mata, Rashford, Lukaku, Martial, Alexis -- and it is fantastic for me and for the team."

Mourinho has lost one attacking player in Henrikh Mkhitaryan, who moved to Arsenal as part of the deal to bring Sanchez to Old Trafford.

The Armenian leaves after just 18 months at the club following a £26 million move from Borussia Dortmund in 2016. He played a key role in the Europa League triumph last season, scoring in the final against Ajax.

However, Mourinho insists Mkhitaryan will be better off at the Emirates, while also suggesting the midfielder could have done more at United.

He added: "I think it was a fantastic deal and a fantastic deal is only fantastic if it is good for everybody. United and Arsenal made a fantastic deal, I lost a fantastic player, Mr Wenger lost a fantastic player, Alexis changed from a fantastic club to a giant club and Mkhi changed for a fantastic club, so was a great deal for everybody.

"I believe Mkhi is going to be even better than he was with us.

"With one-and-a-half years in England, adapted, knows [the league], Arsenal play the way they think, I think is a good move for everybody, that's why I'm also happy for Mkhi.

"Could he perform better with us, could I take more from his talent? Maybe. Could he give a little more also to adapt to us? Maybe, but I don't think regret.

"He's in our history, so good feeling for everybody and a very specific transfer between rivals in a big country which I have to say must happen more times."

Sanchez could wear his new No. 7 shirt for the first time against Yeovil, who sit 21st in League Two.

Mourinho has promised to take a strong squad to Somerset, although he is set to rest one or two big names with a game against Tottenham at Wembley to come on Wednesday.

He said: "We want to win, we know what cups are. We have to go with a very strong team, we are going to rest a couple of players, we have also a couple with little problems we want to try to resolve to have them without problems for the next matches coming in February -- Premier League and Champions League -- but apart from that we go with a very strong team."