Barcelona coach Hansi Flick is pleased to say his first league defeat since December as the newly crowned Laliga champion lost 3-2 at Villarreal on Sunday.

Tajon Buchanan, Canada International, dropped 2-1 to the end of End Barça's 17-game unbeaten streak in the 80th minute, qualifying for the Champions League next season.

Barcelona beat Madrid 2-1 by Sunday on December 21.

The match came just three days after Barcelona won the championship on Thursday at city rival Espanyol, followed by an open bus tour of 600,000 people on Friday.

"I'm very good with it." When asked if he could accept the loss at the party that had accumulated two days.

“It’s time to celebrate today. Teams, players, they’ve done incredible work over the past five months. I always have no excuses, but we played Thursday and we celebrated on Thursday night and Friday.

"I'm still happy with the way we play. We have a chance to win. But today, most importantly, the players and fans are proud of what they have done in this wonderful season."

Ayoze Pérez led the fourth minute at the Olympic Stadium, but Barça fought on the break.

Lamine Yamal's fourth goal in the last six games attracted their level, another excellent left foot strike shot from the right, and Fermín López advanced them in the first half stop time.

Santi Comeaña returned to equality in the 50th minute and performed well on Marc-André Ter Stegen, setting the stage for Buchanan's alternatives to keep points late.

After the match, Barcelona won the Laliga trophy as fireworks filled the sky above the stadium, marking their crowned Spanish champions.

The players then received honors before their friends and family attended the celebrations on the court in the three trophys canceled this season (they also won the Spanish Super Popular Science and Cup).

The message to supporters is that it's just the beginning of the journey, Flick said, adding that he knows improvements are needed next season and that the bar is now responsible.

"I saw the happy faces of[the fans of the parade]and cried because of the success and performance of the players."

“It’s a great thing, but it’s also a responsibility for next year. We’re just starting out with our journey. We have to improve a lot of things next season, but I know we have potential.

"We're going to work hard from the beginning of the season. That's what I can say to the fans. As it is this year. Never give up. We're always trying to win games. It's attitude, mindset."

ESPN reported earlier this week that the club had already advanced in the summer, with central defenders, one defender and another winger when the transfer window opened.

Flick confirmed that he knows where to improve the team next season, but now wants to focus on what the current player gives him in his first season.

"Of course," he said when asked if he had decided where to need steel. “(Sports Director) Deco and I, we’re going to talk about that. Now is the time to speak, and of course we’re going to be there for this time.

"For me, the most important thing is the team. We have players with incredible strength, Lamin, Pedri, Frenki (d de jong), and today I also saw (pau) Cubarsí, his 18-year-old, Raphinha is the highest level...a lot of players.

"To me, Iñigo (Martínez) is an incredible leader. His mindset is incredible; it's special. He's very important in the locker room; (He) has a great connection with the players."

Barcelona still have a game to play, and next Sunday at Sports Club, they will not be on the teams participating in the U.S. Club World Cup until a long break this summer.