MADRID (AFP) - Barcelona winger Pedro Rodriguez believes Lionel Messi's uncharacteristic La Liga goal drought is nothing to worry about ahead of his side's Champions League encounter with AC Milan on Wednesday.

The four-time World Player of the Year has endured a frustrating month on the domestic front.

Messi has failed to find the net in his last four La Liga games against Osasuna, Real Madrid, Celta Vigo and Espanyol since returning from a thigh injury, marking his longest goal drought for over two years.

However, in the Champions League, Messi has been his usual deadly self with four goals in two appearances so far this season and Pedro doesn't see any cause for concern.

"There is nothing wrong with him, he is training very well and very strongly," he said on Monday.

"His figures are spectacular and when he goes two games without scoring it seems like there is something up. He is always the one who makes the difference.

"Leo is always an ambitious player who wants to score a lot of goals. He looks fine to me, the goals will arrive and even more so if you are Leo Messi, the best player in the world.

"He is working hard and also assisting his team-mates, which might go unnoticed. I think he is very calm because he knows the goals will come and everything will be fine."

Messi was the inspirational figure as Barca overturned a 2-0 first-leg deficit when the two sides met in the last-16 of the Champions League last season with a 4-0 thrashing of the Italians at the Camp Nou.

And he also netted in the 1-1 draw in the two sides first meeting in the group in Milan two weeks ago.

That point strengthened Barca's position as group leaders on seven points after three games and a win on Wednesday will guarantee their place in the last-16.