Cesc Fabregas is being heavily linked with a return to the Premier League, with doubts surrounding the Barcelona midfielder's long-term future at Camp Nou.
The 26-year-old was booed by his own supporters when introduced as a 70th minute substitute during Sunday's 2-1 win over Athletic Bilbao, prompting further speculation that he could leave the Catalan club in the summer.
According to The Sun, Manchester United would jump at the chance to sign the Spain international, and are willing to meet his £40million valuation in order to bring him to Old Trafford.
David Moyes failed in his attempts to lure Fabregas last summer, but following the former Everton boss' sacking the Red Devils are ready to return for the former Arsenal captain.
The Gunners are believed to have first refusal on the player thanks to clause in the deal that saw Fabregas leave the Emirates Stadium in 2011, and Arsene Wenger is likely to retain an interest in bringing his old skipper back to north London.
Barcelona are unlikely to cash-in unless their 14-month transfer ban imposed by FIFA is lifted, meaning Arsenal and Manchester United must wait patiently in their alleged pursuit of the Spaniard.
If Fabregas does complete a £40million+ move away from Camp Nou, he would become one of the most expensive midfielders in football history.
Click through the tabs - above or below - to check out which players currently occupy the top 10, with all transfer valuations taken from transfermarkt.com.