Manchester City paid close to £40million to bring Aguero to the Etihad Stadium from Atletico Madrid in 2011, and during his three seasons in the Premier League the Argentina international's stock has continued to rise.
The 25-year-old signed an initial five-year deal before penning a one-year extension last summer, meaning the South American is under contract at City until 2017, and played an instrumental role in the club's title-winning campaign in 2011/12.
Injuries have hampered Aguero this campaign, but he's still managed to net an impressive 26 goals in 28 appearances in all competitions and remains an integral part of Manuel Pellegrini's first-team.
Given his importance, twinned with Manchester City's existing wealth, it's fair to assume it would take a significant offer to tempt the club to selling Aguero, with offers likely to be in excess of £100million.
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