Manchester United will face Everton in the FA Cup semi-final at Wembley after showing class and then character to beat West Ham United.

In the final FA Cup game at Upton Park before the Hammers move to the Olympic Stadium, United manager Louis van Gaal once again engineered a result when he needed it most.

Marcus Rashford gave United the lead in this quarter-final replay after 54 minutes, the 18-year-old collecting a pass from Anthony Martial before curling a magnificent finish into the top corner past West Ham keeper Darren Randolph.

And when Marouane Fellaini bundled in Martial's cross 13 minutes later it looked all over - only for United to have to face a fierce siege in the closing minutes.

United keeper David de Gea, who gave a virtuoso display, had already saved superbly from Michail Antonio when James Tomkins stooped bravely among flying footwear to head in and give West Ham hope with 11 minutes left.

The hosts finally hammered at United's defence with De Gea saving once more from Andy Carroll and Cheikhou Kouyate, the latter ruled narrowly offside as he headed in a rebound.

With Wayne Rooney coming on for the final four minutes in his first appearance in two months after a knee injury, it ended as a very satisfactory night for Van Gaal and United.

Relive Man Utd's win over West Ham

Van Gaal's high-wire act on show again

Manchester United defender Phil Jones described this tie as a "defining moment" in their season - and manager Van Gaal has had plenty of those as he has been surrounded by speculation about his future.

And in this managerial high-wire act, Van Gaal has always seemed able to steady a stumble by pulling out a result when he needed it most.

Van Gaal has fought off his critics with crucial wins at Liverpool and Manchester City as well as progressing in the FA Cup - and the heat was on again here after the comprehensive 3-0 loss at Tottenham on Sunday and more reports of player unrest at his methods.

There was no sign of discord here in a performance that showed control for the first 70 minutes and grit for the last 20 to send United to Wembley and offer Van Gaal the chance to answer his critics with a trophy.

Manchester United's young guns lead the way

De Gea will rightly take the plaudits for another display of the kind that has offered United some respite in their darkest moments - but Van Gaal's willingness to risk young talent paid a rich dividend here.

Youngster Rashford was replaced at half-time at White Hart Lane, his manager unhappy with his performance, but he produced the moment of class that shifted the emphasis and momentum in United's favour here.

As he did when scoring the winner at Manchester City, Rashford showed a clinical edge and natural talent to score that wonderful opener.

And in defence, Timothy Fosu-Mensah showed tremendous maturity, a tower of strength when United needed him most. He was powerful in the air and in the tackle.

United have had their difficulties, but in these two 18-year-olds and Martial they have talent they can build around.

West Ham suffer stage fright

There has been a feeling around the Boleyn Ground that West Ham's name was on the FA Cup this season as they pursued silverware in their last season at the stadium.

Maybe there was a touch of complacency in feeling they had done the hard part with the 1-1 draw at Old Trafford - or perhaps nerves that the dream might be coming close to reality.

Whatever the reason, it was not until the last 15 minutes that they actually started playing to their strengths, using Carroll and bombarding United.

Even then, with United on the rack, their decision making was poor on a night that will be a bitter disappointment to manager Slaven Bilic, his players and everyone at the club.

In the closing moments, with Carroll winning everything in the air, they tried an elaborate corner routine that ended with captain Mark Noble shooting yards off target.

The last hope had gone, as had their chances of winning the FA Cup. The subdued reaction from the home fans told the story.

Man of the match - David de Gea

The stats you need to know

• Manchester United have reached the FA Cup semi-final for the first time since 2011.
• Since debuting for Manchester United, Marcus Rashford has scored six times in 11 games. No other United player has more than three goals.
• Only Juan Mata (8) has more assists in all competitions for Manchester United this season than Anthony Martial (6).
• Marouane Fellaini has scored his first goal for Manchester United since December, ending a run of 12 games without scoring.
• West Ham are now winless in 12 games in all competitions against the Red Devils (D5 L7).

What next?

Both clubs still have hopes of a top-four Premier League finish. Manchester United host Aston Villa on Saturday, while West Ham visit Leicester on Sunday. Manchester United's FA Cup semi-final against Everton at Wembley is on Saturday, 23 April.

More to follow.