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Now they face the more daunting task of attempting to overturn a 3-0 first-leg deficit against Bayern in Munich, after the German giants scorched to a superb victory at Stamford Bridge in February.
It would appear a near formality for Bayern to complete their task, but Flick has typically prepared meticulously for the game and says his team will have no trouble in focusing.
He senses former England midfielder Lampard has the makings of a first-class head coach, so will take nothing for granted at the Allianz Arena.
"I can say Lampard has been doing an extraordinary job with Chelsea," Flick said.
"They've managed to qualify for next season's Champions Leaguethrough the Premier League and they've been pretty successful after the restart.
"I like the way they play and how they've performed."
Lampard could not sign players when he took over at Chelsea last July, as the club were under a transfer ban, which has led him to blood a host of young players this term.
"It was a difficult situation when he started," Flick said."But at the end of the season he really performed an extraordinary season with his team."
Bayern will be without the injured Kingsley Coman and Benjamin Pavard, with Joshua Kimmich expected to again fill in at right-back, with Ivan Perisic and Philippe Coutinho pushing for an attacking role.
Flick, whose team won the domestic double of the Bundesliga and DFB-Pokal,expects Chelsea to be positive and to believe they can turn the tie around, however unlikely that may be.
"If I would be in the position of the Chelsea manager or Chelsea fan, I would say we have nothing to lose, we will try to give all we have and we'll see," Flick said.
"We have respect for our opponents. We know Chelsea havea great and also big squad with lots of players who have fantastic potential.
"I know from my time with the DFB German Football Federation how football is played in England.
"If we look at the development that has been showing for years now,it is unbelievable, it is fantastic, how they bring up new, young players and focus on the youth.