Celtic v Barcelona: Tony Watt waits in wings for shot at the big time due to Georgios Samaras injury concerns To add to Lennon's concerns, Gary Hooper has been ruled out because of a hamstring injury, a problem that will cost the player more than his chance of appearing against a Barca side who have yet to lose this season. The Daily Telegraph understands that Hooper was in line to be called up by Roy Hodgson to the England squad for next week's friendly against Sweden, but that the injury will almost certainly deprive him of the chance to win his first cap for his country. Given the awesome strength of the opposition, it would be natural for Lennon to feel that, without the natural partnership of Samaras and Hooper, he would be fighting with one hand tied behind his back. Not so, it seems, according to the man himself. No, we've got Watt and we've got Miku. I'd have no hesitation about playing Tony," said Lennon. The kid's fearless and he's playing very well at the minute and scoring goals. It's a big ask against Barcelona but sometimes with that lack of fear you can go and be a hero on the night. He's definitely in our thinking, as is Miku. Of Watt, the Hoops manager added: "He's learning as he goes along. We're delighted with him - more than delighted, actually. He's been a huge bonus for us in the last two games. He played very well second half on Sunday and he has different attributes that he brings to the game. He can run channels, he can drive at people, he can score really good individual goals like he did at the weekend. There's a rawness about him that we'll be able to polish off as the years go on but as long as he keeps himself grounded, which he's trying to do, he's in a good place for us. I don't think it comes across in his personality but when he goes out on the pitch his body language is great. Another serious headache for Lennon is the injury which forced Emilio Izaguirre from the field in Sunday's 2-2 draw with Dundee United at Tannadice. We've an idea in mind but that'll obviously revolve around Sammy and with losing Emilio as well, that'll change things - but that's the challenge and we've got good depth and players willing to come in and play who have been playing. And the majority of the squad are in good nick. You hope these nights will inspire them to go out and do something special. Celtic (4-4-1-1, probable): Forster; Lustig, Ambrose, Wilson, Mulgrew; Commons, Brown, Wanyama, Ledley; Miku; Samaras or Watt. Barcelona (4-3-3, probable): Valdes; Alves, Mascherano, Bartra, Alba; Xavi, Song, Iniesta; Alexis Sanchez, Messi, Villa. Referee: B Kuipers (Holland).