The pair will go head-to-head in the DFB-Pokal final on Saturday as Lewandowski looks to end his four-year spell at Dortmund on a high by beating his future employers.
Lewandowski announced in January that he had accepted a contract with fierce rivals Bayern.
"It's great that he's back next year with us," Martinez told Sport-Bild. "But still we are not colleagues - in Berlin he gets from me the full force felt.
"We can then be friends from the summer."
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