Barcelona coach Ernesto Valverde admitted his side were well below their best despite beating Roma 4-1 in the Champions League quarterfinal first leg on Wednesday.
Two own-goals, from Daniele De Rossi and Kostas Manolas, and a close-range finish from Gerard Pique, presented the Catalans with a flattering 3-0 advantage at the Camp Nou before Edin Dzeko snatched Roma a late away goal.
But, just as the Italians looked to have grabbed a lifeline, Luis Suarez restored the three-goal cushion, by scoring a fourth in the 87th minute.
"We did not that have continuity in the game," Valverde said. "We had errors and there were times that we rushed into the attack, instead of having control."
Barca also had the referee to thank for not awarding Roma an early penalty, after Nelson Semedo pushed Dzeko.
"They are already good on their own, they don't need help," Roma coach Eusebio Di Francesco said. "Tonight they had help both from the referee and from us."
"The truth is we know that in the game we can and we must improve in several points," Barca's Ivan Rakitic said.