Barcelona and Argentina star Lionel Messi admits he is finding it difficult to score a goal for the national team after failing again against Colombia.

Messi has scored just one goal at the Copa America, breaking his country’s duck in the tournament against Paraguay, but was kept at bay for the third consecutive occasion by man of the match David Ospina in Friday night's quarter-final victory.

"It’s incredible how difficult it is to score a goal for the national team,” he said after the game.

“We gave our best performance of the Copa America, creating chances all over the pitch, and luckily went through on penalties. “Unfortunately we couldn’t score a goal and were lucky on penalties.”