The Lithuanian forward started the season with the New York Knicks that waived him a few weeks ago.
Kuzminskas has played with New York last season.
Only the signatures are missing before the deal becomes official.
Kuzminskas will sign a deal till till June 2019 with an NBA opt out clause for next summer.
Anadolu Efes tried to sign Kuzminskas but the Lithuanian forward accepted Milano's proposal.