Barcelona forward Lionel Messi will undergo tests on his kidneys after missing out on training on Monday, a BBC report has confirmed.

Balon D’ Or winner Messi had already been diagnosed with renal colic, a type of abdominal pain commonly attributed to kidney stones, which made him miss the FIFA Club World Cup semi-final against Chinese Super League team Guangzhou Evergrande.

Messi has been involved in all of Barcelona’s games since, even scoring in the final of the FIFA Club World Cup, where Barcelona beat River Plate 3-0.

An official FC Barcelona statement 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. Messi will return to his normal duties with the first team on Wednesday.”

He will receive treatment at the Dexeus university hospital in Barcelona, where he will receive shock wave lithotripsy, a non-invasive treatment that breaks up the stones into tiny pieces, according to Mundo Deportivo.

Messi should be available for Barcelona’s return leg of the Copa Del Rey semi-final against Valencia. The game is pretty much sealed after an emphatic 7-0 victory in the first leg against a clueless Valencia, who are now led by new manager Gary Neville.

The Argentinean played the full 90 minutes in the game against Levante, where many critics were unconvinced by the way Barcelona played. Barcelona won the game 2-0 with goals from Navarro and an injury time strike from Luis Suarez.

Messi has scored 13 goals in 17 games for Barcelona this season, and has helped them maintain a 3 point lead at the top of the table.

Barcelona are also set to face Arsenal at the Emirates stadium in the first leg of the knockout phases of the Champions League at the end of February.