Howard chose to join the Houston Rockets after just one year in Los Angeles, and Gasol admits that various things went wrong last season.
"He made his decision and felt like that was the best choice for him and so you respect him for it and that's it," ESPN quotes Gasol as saying.
"A lot of things went wrong last year for sure. There was a lot of adversity. Nothing really clicked. So it was a tough year for everyone."
The Lakers will face Howard and the Rockets at the Toyota Center on Thursday night.