By Kieran King Lionel Messi wanted assurances that Sergio Aguero was staying at Manchester City before agreeing to sign for the club in 2021 – but Pep Guardiola was unable to make that happen. Messi was at Barcelona at the time, playing in what would be his final season, and was heavily linked with a move to City due to the breakdown of his relationship with the Camp Nou club. A move to the Premier League was very much on the cards, according to Argentine outlet El Chiringuito, who at the time claimed Messi was keen to link up with his international team-mate Aguero and former boss Guardiola. …