Before that, Real Madrid beat Mallorca 2-1 at the Bernabeu to narrow the gap with Barcelona to 4 points. However, the Blaugrana have ended Los Blancos' hopes by winning the championship 2 rounds early.
"I feel Barcelona as a family. The club is doing very well, with passion, a positive attitude and a progressive spirit. This has helped me a lot in achieving my goals.
The atmosphere here is wonderful, everyone always cares about each other. Perhaps, that is what makes this place special. I have never experienced anything similar to this before. I am very proud of the team, a team where everyone tries their best" - Flick said after the victory over Espanyol.
After a goalless first half, Lamine Yamal opened the scoring right after the break with a beautiful goal. The young Spanish star dribbled from the right wing and fired a powerful left-footed shot into the top corner of the goal, helping Barcelona take the lead.
"Yamal's goal was a move he practiced a lot. He scored two goals in today's warm-up in the same way. We have to take care of Yamal and let him enjoy it. He was amazing," Pedri said of Yamal.
Immediately after Yamal's goal, Espanyol's Leandro Cabrera was sent off for hitting a 17-year-old player in the elbow. The home team had only 10 men left and Barcelona scored a second goal late in the match to seal the victory.
The match was postponed for a short time when a car crashed into a crowd of fans outside the stadium. Police said it was the result of an accident and that of the more than 10 injured, none were seriously injured.
Flick replaced Xavi Hernandez last summer after a season without a trophy. The 60-year-old strategist quickly helped Barca win three domestic titles: La Liga, Copa del Rey and the Spanish Super Cup.
The La Liga title helped the Blaugrana complete their domestic treble in Flick's memorable debut campaign in Spain, including four wins against Real Madrid.
"You can do that. I appreciate that we are a team. We work hard and everyone is dedicated to the club. This is our job. We want fans to be proud of the team.
It's time to celebrate. What's next season? I haven't thought about it. We have a long holiday. We will analyze everything after that. 5, 6 weeks off for some players. It's good!" - Flick said when asked whether this year's La Liga championship was superior to other titles.
Flick also remembers Carles Minarro, the first-team doctor who suddenly passed away in March this year.
"Carles is right here. He will be very proud of our team, what we have done in the past few months. So we always think about him. We don't forget him, because he's a great part of our team and will always have a place in our hearts," Flick said, pointing to the ceiling.

However, Barca disappointed in the Champions League when they were eliminated in the semi-finals against Inter Milan, despite their best performance in this tournament since 2019.
This is the second time in three years that Barca have won the La Liga championship and the 28th time in the club's history, behind only Rel Madrid's 36 championships.
Flick was appointed last season with the task of turning a relatively young squad into a team competing for the title. The German tactician immediately showed his talent when the Blaugrana won 11 of the opening 12 La Liga games, including a 4-0 away win over Real Madrid last October.
But after building a 6-point gap at the top of the table, Barca's form declined in November and December, losing four of their seven games.
That poor run of results has left them behind Real and Atletico Madrid in the table. Notably, Carlo Ancelotti's side were 7 points behind them in January.
However, Flick's team has made a strong comeback and is still unbeaten in the tournament in 2025, not only catching up with Real Madrid but also rising to the top of the rankings.
Last week's 4-3 win over El Clasico - their fourth win against Real Madrid this season - gave Barcelona a seven-point advantage with just three games left.
The 2024-2025 campaign was marked by Flick's decision to deploy a high formation, causing continuous pressure and attacking regardless of the score.
Barcelona have had some notable matches, scoring 4 or more goals in 13 La Liga matches so far, including two against Real and another against Atletico.
Yamal, Raphinha and Robert Lewandowski all performed excellently, while Pedri's performance in midfield also helped the team continuously achieve good results.