Archer could face old side Tottenham Hotspur in the FA Cup on Sunday.
Tottenham's Hugo Lloris
Archer is in line to face his old side when the Lions travel to White Hart Lane on Sunday, despite having missed the last three weeks with a thigh tear.
And it was the form of long-standing number one Lloris which convinced the former Scotland Under-21 international to seek pastures new.
"I bumped into Hugo [this week] and he was all smiles," Archer told ESPN. "We both had a big grin on our faces. It's been a couple of years since I've seen him and I asked how he's been, and likewise. He asked if I was fit and I told him yes! So I'm looking forward to bumping into him again on Sunday.
"To train with someone like that, the France captain, you learn a lot.
"There aren't many goalkeepers in the world who are going to dislodge the France captain... I was under no illusions that I was going to get first team games. I had to drop down a few leagues and try to make a name for myself.
"As a 15-year-old, my dream was to walk out at White Hart Lane in a Spurs shirt. That didn't materialise and I'm proud to do the same thing in a Millwall shirt."
Despite his ambition, Archer revealed that he didn't grow up supporting the north Londoners and implied that his choice of club was somewhat controversial, without giving anything away.
"I'm not going to say who I support because I'll get in trouble," he added.
"I've got a lot of love for the club, a big emotional attachment. I've got nothing but gratitude for Spurs. I've still got a lot of friends there so I want them to do well. Come Sunday, it'll be good to bump into them but it's not going to be all high-fives and hellos. We're going there for the win and I'll save my talking for after the game."
Jordan Archer warms up for Spurs
Archer only spent one pre-season working under Tottenham head coach Mauricio Pochettino, before being farmed out to Northampton Town and Millwall, where he is the reigning player of the year, on loan.
Prior to that, Archer enjoyed temporary spells at Harrow Borough, Bishop's Stortford and Wycombe Wanderers.
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