In recent weeks the Blaugrana have been strongly linked with Lewandowski, who has stated he will not sign a new deal at the Allianz Arena.
"Lewandowski is one of the options, one of the possibilities," Xavi said during Saturday's pre-match press conference.
"There are negotiations, he has one year on his contract left. It won't be easy.
"[Barcelona president Joan] Laporta told me we'll be able to reinforce the team, there's confidence."
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