Arsenal suffered a 2-1 loss against Watford on Sunday in an FA Cup match played at the Emirates Stadium, dashing the Gunners’ hopes of getting the first FA Cup hat-trick since the 1880s.
Watford eliminated Arsenal in the quarter finals to book a place in the last four.
Goals from Odion Ighalo and Adlène Guedioura were enough to chase the defending champions from the competition this season.
With the win over Arsenal on Sunday, the Golden Boys have now joined Crystal Palace and Everton, who have already confirmed their slots in the semi-finals.
The Yellow Army went two goals up before Danny Welbeck reduced the deficit in the 88th minute, finishing neatly after a one-two with Mesut Ozil.