?Barcelona defender Gerard Pique knows a little bit about what it means to be a great athlete.

The centre-back was briefly part of the fearsome Manchester United squad managed by Sir Alex Ferguson that won the Champions League in 2008 against Chelsea, one of the best teams in English football since the turn of the century.

RCD Espanyol v FC Barcelona - La Liga

He was also an integral part of the Barcelona side coached by Pep Guardiola that became famed for its ‘tiki-taka’ style of play.

So if the 30-year-old has a particular opinion on an athlete throughout the sporting world, it’s probably a safe bet to assume he’s dead right.

Tennis star Roger Federer became the first male player to eight Wimbledon titles on Sunday, extending his record to 19 Grand Slams with a win over Croatian Marin Cilic, and Pique was evidently impressed with the Swiss’ form.

He tweeted: “Leo Messi, Michael Jordan, Roger Federer. The best I’ve seen.”

Federer is undeniably one of the finest athletes ever, having proven his worth time and time again in the tennis world, and definitely warrants a spot alongside Barcelona star Lionel Messi and basketball legend Michael Jordan.