Manchester United managed to keep the Spanish side Celta Vigo at bay with a 1-1 draw at the Old Trafford, to make it to the Europa League final on a 2-1 aggregate score.
However, the Ivorian lost his cool in the later stages of United's game against Celta Vigo on Thursday night.
The Spanish club finally got on the board five minutes before stoppage time when Argentine defender Facundo Roncaglia headed a Theo Bongonda cross into the far corner of the goal.
In stoppage time, the hosts had a chance to seal the victory but an apparent goal by Ander Herrera was disallowed for a foul.
Marouane Fellaini will also miss out as he serves the final part of his three-match domestic suspension.
"When people say we gamble, we didn't gamble, we didn't choose the Europa League - we had to do it".
As reported by United's official website, Josh Harrop scored a hat-trick for the home team as the Manchester club sealed all three points against their London rivals in a thrilling Premier League 2 encounter.
With Ajax on the back foot, Lyon midfielder Rachid Ghezzal set up a frantic finish when his downward header from Poland midfielder Maciej Rybus' excellent cross from the left made it 3-1 in the 81st.
The hosts continued their attacking play in the second half. We had a fantastic record of 25 matches.
United will face Ajax in the final on May 24, three days after the final Premier League game of the season at home to Crystal Palace, who may still be fighting for survival. The victor will secure a berth in the 2017-2018 Champions League group stage. The Saints are now sitting in ninth place in the table and are ready to welcome Manchester United looking to avoid slipping up a couple of points lower in the table. "Try to understand who can give me a little bit more for the final.
But if I was on your side and you are always looking for these kinds of capital letters, big headlines, I accept if you say that".
United have not shot up the league under Mourinho but the performances have boosted fans worn down by his predecessor Louis van Gaal's prosaic style and starved of the success they had grown used to under Sir Alex Ferguson. "Finals are always fun, and the Europa League is a big, attractive competition".