The coach spoke to the media after the 1-0 win at Camp Nou on Sunday
Barcelona coach Xavi Hernandez conceded his side were not at their best as they beat Getafe 1-0 at Camp Nou on Sunday.
Pedri scored the only goal of the game as Barça maintained their three point lead at the top of the table despite hitting top form.
"I don't think we played well, we were off our game," Xavi said. "We did not attack well. We did defend well. It is hard to attack against such a low block.
"We have to improve. But it was a really important win. We kept a clean sheet. We were good without the ball, but we didn't create enough. You could feel the mental tiredness from the Supercopa. It's three points without playing well."
With Robert Lewandowski suspended, Ansu Fati started, but he could not follow up his midweek Copa del Rey goal with another striker.
"He worked hard but didn't have a lot of chances because of how Getafe defended," Xavi added. "He helped us in defence."
In addition to missing Lewandowski and Ferran Torres due to bans, Barça were also without Ronald Araujo and Frenkie de Jong, while Andreas Christensen and Alejandro Balde both came off at the break.
"Christensen had some discomfort but nothing serious," Xavi explained. "Balde was a tactical substitution. We needed Jordi inside. Araujo and De Jong were not 100 percent so we saved them."