The Scottish champions head to then Nou Camp for their final Group H fixture and could be boosted by the return of Welsh full-back Matthews who has been sidelined since early October with a broken collarbone.
“Adam is there now and he will add to the squad,” said the Hoops boss.
“He is a very good player and very versatile as well. He was starting to hit really good form and it was a sore one for him.
“He has made a very good recovery and I’m hoping we will see him in the team in the next week or so.”
Lennon added: “Biton, Samaras and Matthews will be in the squad for Barcelona, and hopefully Forrest will be fit for Wednesday.”
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