The Blaugrana confirmed this on their official website via a statement.

After a disappointing end to the 2018/19 campaign with Barcelona and an unflattering Copa America campaign with Argentina, Lionel Messi was aiming to start the new season with a bang.

However, the Argentine's return will have to wait a bit longer as the club have confirmed that their talisman forward has picked up an injury. The Blaugrana confirmed that the 32-year-old picked up a knock during training.

The five-time Ballon d'Or winner was on the bench for his club's recent clash with Arsenal. The Catalan heavyweights hosted the Gunners for the Joan Gamper Trophy, with Valverde's men winning 2-1 without the help of their talisman.

However, he will be needed once the season begins but he is now a doubt after being diagnosed with a grade one calf strain. The reigning Spanish Primera Division champions announced this one their official website via a statement.

"First team player Leo Messi, who had returned from his summer break for training on Monday, withdrew from the session due to discomfort in his right leg. Tests carried out have diagnosed a Grade 1 calf strain for the Argentine," the statement read.

What does this mean for his availability? Firstly, the Barcelona captain will play no part in their USA tour, which means he will miss both clashes with Napoli.

Having not played a single game during the pre-season, La Pulga will hope to be back in time for their opening game. However, no return date was given, with the club merely stating that his layoff will be determined by his recovery.

The new season kicks off in less than two weeks with a trip to Athletic Bilbao for the reigning champions. Only time will reveal whether the iconic forward will be ready for that tie.