The Dutchman endured a frustrating debut season at Old Trafford but is determined to succeed under the Portuguese boss.
He failed to win over fans since his £25million signing and only managed to score two Premier League goals under Louis van Gaal last season.
In his latest video on Twitter, Memphis showed off his gruelling gym routine.
The hard work never stops 💪🏾https://t.co/ROhqoZQ195
— Memphis Depay (@Memphis) June 23, 2016
Memphis has shown plenty of potential, particularly in Europe, but his lack of consistency made it hard for him to cement his place on the first-team
He was angry with the way his season turned out under van Gaal and will no doubt be relishing the opportunity of a fresh start under Mourinho.
The youngster will be given plenty of chances under Mourinho and has gone the right way about it by working hard over the summer to get the best chance of succeeding at United.