Barcelona: Lionel Messi is expected to play in Barcelona's King's Cup semi-final against Valencia, despite missing training on Monday to have tests on his kidneys, the La Liga club said.

"Barcelona striker Lionel Messi will undergo several tests on Monday and Tuesday to assess the evolution of the kidney problems he suffered last December," Barcelona said in a statement on their website.

"Messi will return to his normal duties with the first team on Wednesday."

The Argentina international missed his team's Fifa Club World Cup semi-final in December as he was suffering from renal colic, a type of abdominal pain often caused by kidney stones.

Despite the problem, he played in the final three days later and has also played in all of Barca's league games since.

Barcelona coach Luis Enrique refused to give any hints about his line-up for for Wednesday.

Barcelona lead 7-0 from the first leg which should give Enrique the chance to rest players including Messi.

"We have prepared for the match in the same way as if we didn't have the result of the first leg," Enrique told a news conference on Tuesday. "I haven't got anything to say with regards to Messi," he added.

"Tomorrow I will give the (team) list, as always. Our objective remains the same, to be better than our rivals. We forget about the first leg result."

That result and Valencia's 0-1 defeat at Real Betis on Sunday have increased the pressure of their English coach Gary Neville, who has gone nine Liga matches in charge without a win.

Enrique was not feeling sympathetic, however.

"I don't like to give hints to rival trainers, I will name the team tomorrow," he said.

"It's not an easy match. We'll need to find stimuli for the players to compete at a good level. We'll have to see if we're capable of still being competitive in any situation. I hope the team show up and go for the win from the off."