After a relatively quiet winter transfer window, showing the economic effects of COVID-19, the footballing world is expecting a busier summer, but all eyes are trained on Barcelona, with so much depending on Leo Messi's big decision.

The Argentine star made it clear only recently, in an interview with Jordi Evole, that he intends to leave his decision until the end of the season, when his contract at the Camp Nou will be just days from expiring.

If the conclusion he arrives at is that he wants a new challenge elsewhere, it could set in motion a domino effect of major transfers across Europe.

The details of his lucrative Barcelona contract, revealed by El Mundo, which the club in its current condition cannot hope to equal, suggest his time in Catalonia may truly be up.

Few clubs could put together a viable deal for Messi, making Manchester City and PSG perhaps the only two plausible destinations if he does elect to move on.

PSG are known to be keen on Messi, but despite all their Qatari money, they would likely need to sell Kylian Mbappe in order to make the numbers work.