Chelsea striker Olivier Giroud says mental strength separates the great players from the run-of-the-mill.

World Cup winner Giroud has also lifted four FA Cups with Arsenal and the Blues, a French title with Montpellier and scored over 200 goals for club and country leaving winning the Premier League as his “last dream."

And the biggest attribute the World Cup winner has needed to achieve all he has in his career so far?

“For me, mental strength is at least 70, 80 per cent of a sportsman's quality," Giroud insisted to the Mirror. “If you don't have it, you cannot be successful. It's massive nowadays, that's why I would advise some clubs to work on this as well."