The World Player of the Year was on international duty with
He told El Mundo Deportivo: "I haven't been able to do a good pre-season for a long time because I always arrived late. It has been very good to have such a long rest."
Messi scored a European record 72 goals last season and it took him just 45 minutes to score his first hat-trick of pre-season as Barca romped to an 8-0 win over Raja Casablanca on Monday (AEST) with
It was the Argentine's first experience of playing under new manager
"The way of training has continued in the same way and we are working with the same people so we haven't noted any changes," he said.
"We are in pre-season and so you notice the tiredness. They kept the ball well and made us run a lot but we will get better with every game.
"We are training very hard and we have to continue like that to arrive in the best shape possible for the important matches."
Arsenal Sarandi climbed to fourth in the Argentinian Clausura standings on Friday with a 1-0 home win over