But after four wins and a draw in the section, the visitors went down to second-half goals from defender Andrei Burca and midfielder Damjan Djokovic to secure second spot for Dan Petrescu's side.

Lennon said: "Obviously I'm disappointed to lose the game but in the main very pleased with what I got out of the game.

"I'm happy to have used the squad tonight because we have so many important domestic games coming up.

"Some players needed the games and needed the 90 minutes. Scott Robertson made his debut and had a terrific debut. For such a young player he showed such maturity and composure.

"My only criticism is I thought we were very passive at the start of the second half and I'm disappointed to lose a goal from a set play.

"But overall we've had an amazing campaign. The campaign wasn't about tonight. The campaign for us was done and dusted and we've already won a trophy so I didn't want to risk injury.

"I wanted to give others some experience and game time and they'll need that for the games coming up.

"I thought (Olivier) Ntcham was unbelievable, to give him the captaincy and to take on the responsibility the way he did.

"I thought he was top class. I was pleased for Craig Gordon as well, he made some important saves."

Celtic's 16-year-old attacker Karamoko Dembele replaced Mikey Johnston in the second half to become the youngest ever player for the club in a European competition.

Lennon said: "That wasn't at the forefront of my mind. We think very highly of him. I wanted to give him some experience. I want to keep him around the squad because he's a real talent."

Academy graduate Robertson claimed his debut was "a dream come true for me and my family."

He added: "It was brilliant for me. I was taken aback on Wednesday when I knew I was starting. I was a wee bit nervous but mostly it was excitement through the day.

"I thought I was okay. I started the game quite well. It took a while for my second wind to kick in but I thought I grew into the game very well."