Nutritionist Giuliano Poser has confirmed that he helped Lionel Messi change his diet, leading to the Barcelona star's outstanding 2014-15 campaign.

Messi scored 58 goals and contributed 23 assists as Barcelona won the Champions League, Copa del Rey and La Liga Treble, making him a huge favourite for the 2015 Ballon d'Or award.

This followed a disappointing 2013-14, which was disrupted by injury and saw Barca fail to win a trophy for the first time in six seasons.

Messi then started the World Cup impressively but appeared to tire and was unable to prevent Argentina from losing 1-0 to Germany in the final.