Thomas Frank took plenty of positives from Brentford’s FA Cup defeat to Premier League high-flyers Leicester but couldn’t hide his frustration at the soft goals which turned the tie on its head.

The Bees took an early lead through Mads Bech Sorensen but the visitors scored twice in the first six minutes of the second half to seize control.

Cengiz Under made the hosts pay for losing possession in their own half, sweeping home James Maddison’s pass to level the scores, before Youri Tielemans slotted home from the spot having been bundled over in the area.

Maddison sealed Leicester’s progress with 19 minutes to play, denying Brentford the chance to replicate their Carabao Cup heroics which saw them reach the last four.

“We played a good first half,” Frank said. “In the first 10 minutes, Leicester were better than us but we grew into the game and competed well.

“We tried to do it on our terms and we made it a challenge for Leicester.

“At half-time, we spoke about making the middle to lower block difficult to break down and we needed to take better care of the ball (in the build-up to the first goal).

“Then we were sleeping on a short corner, not getting out quickly enough. Maybe it’s a soft penalty, maybe not, but it doesn’t matter – we need to avoid the situation.

“Then it’s difficult to get back into it – one soft goal you can maybe recover from, but two is hard.”

Frank made six changes to the side which beat Luton in midweek and also took the opportunity to bring three 19-year-olds – Max Haygarth, Aaron Pressley and Alex Gilbert – off the bench in the second half.

“We played some youngsters who can compete to be starters,” he said.

“All of them can learn from a Premier League side, especially one who are third in the league and playing very well.

“They have some world-class players, especially Tielemans and Maddison. They (Brentford’s young players) can learn from them – how quickly they see and anticipate things in the game.

“It’s never a good experience to lose but there’s always something you can take. Either you win or you learn – today we learned.”

Brentford return to action on Wednesday night with a trip to second-placed Swansea City.