Arda Guler struck the only goal as Real Madrid won 1-0 at Getafe on Wednesday to claw back to within four points of LaLiga leaders Barcelona.
Barcelona inched closer to the LaLiga title with a 1-0 win over Mallorca on Tuesday which took them seven points clear of Real Madrid.
Flick said it was one of those comebacks that nobody forgets easily, adding it was not easy to win after Borja Iglesias netted a hat-trick to give Celta a 3-1 lead.
Barcelona will be aiming to open up a seven-point lead at the top of LaLiga table when they welcome Europe-chasing Celta Vigo on Saturday.
Barcelona coach Hansi Flick on Friday demanded to meet with La Liga officials over what he called a "joke" schedule, saying Spanish football was failing to take care of players.
Barcelona are through to the Champions League semi-finals with a 5-3 aggregate win, despite losing 3-1 at Borussia Dortmund on Tuesday with Serhou Guirassy hitting a hattrick.
Flick's side, undefeated in 24 games across all competitions, are not taking Dortmund for granted despite carrying a 4-0 advantage into the return at Signal Iduna Park.
Trailing 4-0 going into Tuesday's Champions League quarter-final return home leg against Barcelona, Borussia Dortmund coach Niko Kovac said his side can draw inspiration from Liverpool's 2018-19 comeback against the same opponents.
Barcelona extended their advantage in the Spanish top flight with a 1-0 win at Leganes on Saturday, completing a 12-match unbeaten run and moving seven points clear of second-placed Real Madrid.
Los Blancos were beaten 1-0 at relegation-battling Espanyol on Saturday and subsequently sent a furious letter to the Spanish football federation blasting the country's refereeing as "rigged" and "completely discredited".
Barcelona playmaker Pedri extended his contract by four years through to June 2030 on Thursday in a boost for club president Joan Laporta who has been in the spotlight over the handling of the Dani Olmo debacle.
Balde was full of praise for Atalanta, who won last season's Europa League, but was left stumped by an Italian journalist's other question about their coach Gian Piero Gasperini's style of play at a press conference on Tuesday.
Santos' president told Brazilian superstar Neymar it was "time to return to (his) people" in a video published on social media on Tuesday.
Barcelona sit third in the standings with 42 points, three behind second-placed Atletico Madrid and seven adrift of leaders Real Madrid.
Barcelona need to maintain their focus till the end of games to ensure they stop dropping points in matches they should have won, coach Hansi Flick said on Saturday, after his team slipped to third in LaLiga due to a four-match winless streak.
The 25-year-old joined Barcelona in 2018 from Uruguayan side Boston River and has established himself as a core member of Hansi Flick's team.
Barcelona were 4-2 down towards the end of the match before goals from Robert Lewandowski, Eric Garcia and Raphinha secured their comeback.
The Catalan giants have won just one of their last eight league games, falling behind rivals Real Madrid and Atletico Madrid, but by contrast are flying high in Europe.
Record 31-time Copa del Rey winners Barcelona will face Valencia in the quarter-finals, after they were paired in Monday's draw.
