The LaLiga leaders came from behind twice to earn a 3-3 draw with Inter in the first leg on Wednesday but continued to show defensive frailty.

"We conceded a lot of goals at home again and it's unacceptable," Barca forward Raphinha said.

Flick's side have scored over 150 goals in all competitions this season but a hectic schedule has taken its toll on the home stretch and Barca have kept only one clean sheet in their last five games.

"Of course, every team has its strengths and weaknesses," Flick told reporters.

"When you play every three days, it is not easy to work on certain things. But at the moment the situation is this: these are things that happen."

Barcelona have less than 72 hours to rest before they play Real Valladolid on Saturday, an easy fixture on paper since LaLiga's bottom side were relegated from the top flight last week.

Barca thrashed Valladolid 7-0 in August as the team with just four wins and the worst defensive record (81 goals conceded in 33 games) welcome the leaders with nothing to lose but their pride.

--Reuters--