The Boston Celtics announced the signing of four players on Tuesday -- Jason Collins, Keyon Dooling, Dionte Christmas and Jamar Smith.

The details of the contracts were not released, but both Collins and Dooling reportedly had agreed to one-year deals for the veteran minimum of $1.35 million.

Dooling averaged 4.0 points for the Celtics last season, and Collins averaged 1.3 points and 1.6 rebounds for the Hawks last season.

Christmas and Smith secured contracts with their play during Boston's two summer leagues.