"We're still hurting," he said after Barça's threw away their own title hopes in recent weeks.
"We slipped up in some important games and now we have to take a break and see if we can improve next season to be a team that can win everything."
The French forward didn't give too much thought to his 20th goal of the campaign, which claimed the three points at Eibar.
"The most important thing was to win today but we're still disappointed and we have to work hard," he added.
Asked for reasons for Barça's failing this season, he said: "Sometimes we have made mistakes in attack. I have missed chances. It's a bit of everything. Now to work hard and improve."
On his former side Atletico, who he left in 2019, winning the league, he was at least happy.
"Congratulations to Atletico," he said. "I am really happy for them, for Cholo, for Koke, all my friends there... the fans deserve it."