The ‘secret drug’ Lionel Messi took during Barcelona’s 3-1 win over Olympiacos in the Champions League on Wednesday, has been revealed.

Spanish paper, Sport, claim it was a glucose tablet.

The report added that the best time to take the tablet as “before the first 15 minutes of physical effort is when the muscles are most receptive”.

Messi pulled it out of his socks and swallowed it in the 10th minute.

It is usual for athletes to take these tablets, but rarely is it seen during the game. Instead they are often take them after the warm-up and before the game.

Messi ended up scoring his 100th European goal during the encounter.