Arsene Wenger says he hopes his farewell match at Old Trafford on Sunday passes off "peacefully" but has admitted he is unsure he will ever be friends with Jose Mourinho.
68-year-old Wenger made the surprise announcement last week that he will end his 21-year reign at Arsenal when the season is completed.
His rivalry with Mourinho often spilled over into physical altercations dating as far back as when the Portuguese took over at Chelsea in 2004 and grabbed Premier League supremacy. Wenger had not got the better of Mourinho in a competitive game until Arsenal beat United 2-0 at the end of last season.
Mourinho has greeted Wenger's announcement warmly and even suggested they could "even be friends in the future".
"It depends," said Wenger. "I respect him of course... you should give me a little bit of peace for my final weeks and not try to push me into another confrontation.
"I want to go peacefully, and with Mourinho now because he is a great manager. I say goodbye to everyone. In France we say 'au revoir' which means you might see me again."
Mourinho on Friday said he regrets the "negative episodes" that have marred his relationship with Wenger. The Portuguese said he was unhappy with some aspects of his behaviour over their 19 meetings.
"There are little things where it would be obviously be better without them, some gestures, some words would be better without it," said Mourinho, who called on United's fans to give Wenger a positive reception.