Lehmann's Arsenal return was humiliating for Almunia after the pair had publicly fallen out during their first spell together at the club.
But 35-year-old Almunia insists he has now settled his differences with the German and only wishes well to all his old colleagues, team-mates and even the Arsenal fans who mocked and jeered him.
"I have my opinion about what happened when Jens came back and I know the truth, but I don't want any trouble now - I have moved on," Almunia told the Sunday Mirror.
"I guess the boss was angry with me, but I never asked him or spoke to him about it.
"But I haven't got any problem with Jens. We have a great relationship now, which is strange.
"Jens was very competitive on the pitch and in training, sometimes too much. But off the pitch he is a lovely person and our relationship ended well.
"It wasn't a good moment for me when the Arsenal fans jeered me, and the end was very tough.
"But now I have left, all I have in my heart is good memories and good thoughts for Arsenal, the manager, the players and the fans.
"I would love to go back there with Watford. That would be my dream."