The team that drafted him, won two Finals with him on the roster and wanted him back this season, on a two-year, $5.2 million contract, with rotation minutes his for the taking. Golden State has 48 hours to decide if they will match the Cavs' offer.
The Cavaliers or Warriors could waive McCaw before January 7 and not be responsible for paying the remainder of his contract.
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The 29-year-old had barely played at the back end of last season, despite being fit after a hamstring injury, as Pochettino appeared to freeze him out.
Matching the McCaw offer sheet would have elevated the Warriors' luxury tax bill $11.3 million to $61.6 million.
The 23-year-old McCaw had been expected to be in the defending National Basketball Association champion's rotation this season but didn't re-sign with the team as a restricted free agent. The person spoke to The Associated Press on condition of anonymity Friday because it remains unclear if Golden State will exercise its right to match the terms.
He averaged four points, 1.4 rebounds and 1.4 assists in 57 games last season. Signing McCaw would also fill the 15th spot on the Warriors roster with DeMarcus Cousins nearing a return.