Ferguson retires after Sunday's trip to West Brom but he was very much in charge for Monday night's trophy parade from Old Trafford into the centre of Manchester.
The 71-year-old spoke to the thousands who gathered to watch the bus leave, setting his players a challenge they last achieved between 2007 and 2009.
"We have a young squad, with a lot of good young players, who are going to get better," he said.
"The big test is to win it three times in a row. I hope the boys can do it."
Ferguson thanked the fans for the reception they gave him during the 2-1 win over Swansea, his final game at Old Trafford.
"(Sunday) was a day I will never forget," he said. "I thank you for that."
Ferguson also urged supporters to turn up for Tuesday's Under-21 encounter with Liverpool at Old Trafford.
"We play that mob across the road," he said.
"I hope some of you cheer the young lads on."