Manchester United midfielder Bruno Fernandes was involved in a car crash on the way to the club's training ground, but was unhurt and should be available to play against Liverpool.
Sancho, signed from Borussia Dortmund for $100 million, was also given the final 15 minutes as a substitute to soak in the Old Trafford atmosphere in front of 72,722 fans.
Cavani scored two of United’s five second-half goals, with Fernandes adding a penalty to his brilliantly taken first-half opener before Paul Pogba and substitute Mason Greenwood also netted.
The Portuguese midfielder, who saw the ball coming at his chest height and going away from him, made a terrific manoeuvre to raise his feet high to receive the ball
Since arriving at the Old Trafford last year, 26-year-old Bruno has scored 28 goals in 53 appearances.
Fernandes blasted the ball past the otherwise excellent goalkeeper Karl-Johan Johnsson to give United the 95th-minute lead.
Mourinho, in his own inimitable style, took a swipe at United's penalty record this term while describing Fernandes as one of the best penalty takers in the world.
On Sunday, Manchester United lost 1-3 to Chelsea to crash out of England's Cup competition.
Bruno Fernandes emulated fellow Portuguese Cristiano Ronaldo, as he won the Premier League Player of the Month award for the second time in a row.
The 25-year-old January signing has now scored in two of the three Premier League games since the season resumed after the three-month pandemic-enforced suspension.
Bruno Fernandes, who joined Manchester United in January, has said that he is excited to team-up with Paul Pogba in the midfield.