The 25-year-old originally joined Villa matured six, yet was endorsed by Manchester City for a British record £100m on Thursday.
Addressing the media interestingly as a City player, the midfielder said: “Everybody has seen the manner in which Messi was at his last question and answer session.
“That is simply the specific way I felt.”
The England player added: “Before I left at the inn I addressed the group, the staff and the players and I teared up a bit myself.”
Grealish said he had held an Aston Villa season ticket since the age of four and that leaving the club was “perhaps the hardest choice I’ve at any point needed to make”.
“I felt like it was the ideal opportunity for me to continue on,” he proceeded.
“I’ve generally said the amount I needed to play Champions League football – I was unable to do that at Villa this year.
“I have come here to win flatware and play in the Champions League, so that is my lone concentrate now.”
The £100m charge for Grealish outperformed Paul Pogba’s £89m move to Manchester United in 2016 as the most elevated exchange expense paid in English football history.
The midfielder – who joins on a six-year contract – is required to make his Premier League debut for City at Tottenham on Sunday.
Grealish set out a few explanations behind needing to join City, including his expectation it would support his odds of a beginning spot with England, and his longing to play under administrator Pep Guardiola.
He said playing in the Champions League and “performing” for the club “could set me up to have a splendid future with the public group”.
Grealish dazzled for England in Euros warm-up successes against Austria and Romania and made one beginning and four substitute appearances, enrolling two helps, for England during the competition.
He added that he needed to “attempt and begin in these games at the World Cup [in 2022] and in the qualifiers”.