The goalkeeper has endured constant speculation about his future, with AC Milan and Bayern Munich both reportedly keeping tabs on him.

Boruc will take a break from club affairs when he features in this summer's tournament with Poland in a group that also includes Austria, Germany and Croatia.

And former team-mate Lennon - now a coach at Parkhead - would not be surprised if his displays earn him a dream move to a top club ahead of the new campaign.

"If Artur has a good European Championships, we might get an offer that means he's impossible to keep," Lennon said.

"We want to hold onto our better players but if you get a ridiculous transfer fee offered, it might be too much for the club to refuse.

"Artur has been fantastic. I'm not saying he is going to leave - and we would be delighted if he stayed on - but he might be impossible to keep if he keeps playing the way he has been playing.

"But it's the same for any player."

Georgios Samaras is another who could potentially find himself in the shop window at this summer's finals.

The Greek striker impressed while on loan from Manchester City and says Celtic are his first choice for a permanent move, despite being linked with Werder Bremen and Fenerbahce.

But Lennon admitted: "If Georgios has a good tournament, his price tag might go up a couple of million as well.

"I hope he plays well - but not that well."

One man Lennon is determined to see Celtic hold onto is manager Gordon Strachan.

Strachan has yet to fully win over a section of the Hoops support and suffered his fair share of criticism last term before claiming a third successive title.

But as far as Lennon is concerned, he is still the right man for the job.

"I'd be disappointed if he upped and walked away from what he has built," he said.

"He is building every year and he has more or less built three different teams since he's been here.

"It's a young, vibrant squad we have now and we just need to add a bit more quality to it and we could push a lot of European teams a long way.

"I like his personality and the way he prepares the team and I like his ideas on the game as well.

"He is very meticulous in the way he approaches games and he's a man-manager as well. He feels for the players when things aren't going so well.

"But what he has done more than anything is stick to his principles this season.

"He was getting a wee bit of criticism here and there but he knows that's part and parcel of being an Old Firm manager and, in the end, he came up trumps again and I admire him for that as well.

"The manager has learned from the best. He played under Alex Ferguson for a long, long time and I'm sure that will have rubbed off on him."

As well as retaining the services of key players, Lennon believes bolstering the current squad is also an essential job for Strachan over the summer.

"I think it's in all the areas that we need to strengthen," he said.

"We have quality players already but you can't have enough in the starting XI and on the bench.

"That was proved last season with the strength and depth that we had.

"We were able to bring on the likes of Samaras and Scott Brown, who changed games for us.

"The more quality and depth you have, the better you will be."

Rivals Rangers will also bolster their squad over the summer, with Kenny Miller set to cross the Old Firm divide yet again.

The Derby striker is expected to strike a deal with his former club next week, despite a section of the Rangers support making it clear they would not welcome his return.

But Lennon believes his old club-mate has the character to cope with the controversial move.

"I think Kenny has got a strong mentality," he said.

"He got a lot of publicity when he came to Celtic and he took that in his stride and I think, if this move comes off, he would take that in his stride again.

"We're moving on now and we're not in the dark ages anymore.

"Players are moving from either side of the Old Firm - maybe not on a regular basis but a lot more than they used to do."