Sources: Celtics sign Jordan Schakel to Exhibit 10 contract

The Celtics signed Jordan Schakel to an Exhibit 10 contract on Wednesday, according to sources. The 26-year-old guard played for Maine last year after signing a training camp contract last September. He averaged 13.0 points and 5.2 rebounds per game and shot 40.2% from three on 7.3 attempts per game.

The move fills Boston’s offseason roster for now, with three two-way signings and Exhibit 10 contracts for Lonnie Walker IV, Ron Harper Jr., Tristan Enaruna and Schakel giving the Celtics 21 contracts. Exhibit 10 players, who have non-guaranteed contracts, can be waived at any time and receive a bonus for spending a certain amount of time with the pro team’s G-League affiliate. That means…