From ESPN.com:

As the Yankees kept talking about trading Randy Johnson, they finalized their $20 million, five-year contract with Japanese pitcher Kei Igawa on Wednesday.

The Yankees had until Thursday to complete an agreement with Igawa after bidding $26,000,194 last month for the right to negotiate with him. The left-hander went 14-9 with a 2.97 ERA and 194 strikeouts for the Hanshin Tigers last season.