The Argentine's final season at Manchester City was marred by injuries, but he proved his fitness during his final Premier League game with a brace against Everton.
However, Barcelona confirmed earlier this week that Aguero has suffered an injury to his right calf, one which is expected to keep him sidelined for the next 10 weeks.
According to Spanish journalists Adrian Sanchez and Alejandro Carrasco on the Mas Que Pelotas podcast, Barca inserted the 'injury clause' into the striker's deal, which allows it to be terminated if his fitness woes prevent him playing enough matches.
Aguero was also alleged to have wanted out of Barcelona following Lionel Messi's departure, although subsequent reports instead claimed that he has no intention of leaving.
The 33-year-old featured on just 21 occasions for Man City in the 2020-21 season, and he missed 41 games for the club through injury or illness during his final two years at the Etihad.
Lazio 
Bologna 
Empoli 
Udinese 
CSKA Moscow 
Rubin 
Slovan Bratislava 
AC Milan 
Sparta Praha 
Atletico Madrid 
Valencia 
Barcelona 
Stade Brestois 29 
Bayer Leverkusen 
Red Bull Salzburg 
Bayern Munich 
Paris Saint Germain 
Inter 
RB Leipzig 
Manchester City 
Feyenoord 
Sporting CP 
Arsenal 
FC Rostov 
Spartak Moscow 
Aston Villa 
Juventus 
Celtic 
Club Brugge 
Dinamo Zagreb 
Borussia Dortmund 
Liverpool 
Real Madrid 
Monaco 
Benfica 
PSV 
Shakhtar Donetsk 
Lokomotiv Moscow 
Dinamo Moscow 
Anderlecht 
FC Porto 
AZ Alkmaar 
Galatasaray 
Dynamo Kyiv 
Viktoria Plzen 
Ludogorets 
Qarabag 
Lyon 
FC Heidenheim 
Chelsea 
FC Midtjylland 
Eintracht Frankfurt 
Manchester Utd 
Bodo/Glimt 
Nice 
Rangers 
Real Sociedad 
Ajax