United defeated West Ham 2-1 in lasat night's sixth round replay at Upton Park.
Marcus Rashford and Marouane Fellaini got the goals for Man United.
They now face a trip to Wembley to face Everton on Saturday-week.
United manager Louis van Gaal says that he's desperate to bring some silverware to Old Trafford.
Also last night, Crystal Palace and Everton played-out a scoreless draw in their Premier League clash at Selhurst Park.
Irish international James McCarthy saw red for Everton after picking-up a second yellow card at the start of the second-half.
Later tonight, Liverpool go in search of a Europa League semi-final spot.
The Reds will play host to Jurgen Klopp's former Borussia Dortmund charged in the second-leg of their quarter-final after it finished one-all last week in Germany.
Kick-off at Anfield is at five-past eight.
