The Red Devils confirmed Moyes' departure on their Twitter feed at around 8:30 on Tuesday morning, although reports of his imminent exit had been circulating for almost 24 hours.
The former Real Madrid boss returns to the Spanish capital tonight for the first leg of Chelsea's Champions League semi-final, and the Brazilian defender is confident Mourinho's masterplan will lead them to a third successive European final.
Injuries have been a major factor behind the Gunners struggles this season, but the German is confident Arsene Wenger's charges can secure fourth place.
Silva was stretchered off during the second half of Monday's 3-1 win over West Brom after appearing to suffer a recurrence of a recent problem.
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