Onze says Barcelona sporting director Deco has identified Darwin Nez, 24, as the main candidate in the event Lewandowski leaves this summer.
And Nunez is said to be keen on the move.
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Barcelona's "Plan B" is Newcastle striker Alexander Isak, 24.
Isak is tied to Newcastle until the summer of 2028 and they're eager to keep him. Isak has scored 24 goals in 37 competitive matches this season.