Celtic manager Neil Lennon hopes that adding experience to his stuttering side will salvage their European campaign after crashing out of the Champions League to Sporting Braga at the first hurdle.

A 2-1 home second leg win on Wednesday night was not enough for Celtic as they exited 4-2 on aggregate to the Portuguese league runners-up in their third round qualifying tie.

The result means Celtic will now have to negotiate a play-off for a place in the Europa League, losing out on the much-needed Champions League cash to Old Firm rivals Rangers for the second year running.

The Glasgow side have failed to keep a clean sheet during a dismal pre-season, conceding 15 goals in eight games, and ­manager Lennon admits he is worried about his side’s defensive ­frailties.

When asked if he would be happy going into the Scottish Premier League season and Europa League campaign with his current back four he said: “Obviously, I wouldn’t be if they were struggling to keep clean sheets but if I have to then I will.

“We keep conceding poor goals. I’m learning from it and hopefully a few of the players are too. I would like to keep a balanced back four as much as we can so they can build up some relationship between each other.

“We will think about that over the next couple of days and hopefully we will get one in or two if we can in the meantime.”

The club have brought in seven new signings in the summer transfer window but have missed out on a couple of high-profile players, most notably Sol Campbell, England keeper David James and midfielder Jamie Bullard.

And the Celtic boss believes it is players of their calibre that are needed to give some much needed experience to his squad.

“Looking at the squad there is still a bit of inexperience and that’s why we went for Campbell and that’s why we went for James and Bullard but we will keep going,” Lennon added.

At Parkhead on Wednesday Celtic had always faced an uphill battle after their 3-0 defeat in Portugal but the home side’s task became even tougher when Paulo Cesar claimed a vital away goal as he headed Braga in to a 20th-minute lead.

Celtic looked flat in the first half but were vastly improved after the break and Gary Hooper restored some pride in the 51st minute when he netted on his competitive debut.

Mexican midfielder Efrain Juarez briefly gave the home fans hope when he headed Celtic into the lead 12 minutes from time but it was too little too late.

The Celtic boss said he expected to meet with want-away winger Aiden McGeady this week to find out his decision about a potential move to Spartak Moscow.