Pelle, 28, is 6-foot-10 and signed a 10-day deal with the Jazz in January, appearing in three games. He signed a 10-day deal with the Celtics in late December, though he did log any minutes. Before that, he had been playing with the Cleveland Charge of the G League, averaging 8.9 points, 8.3 rebounds and 1.1 blocks.
He has spent time in the NBA with the 76ers, Nets, Knicks and Kings, compiling career averages of 2.1 points and 2.5 rebounds.
Portland has 15 players under contract, but has one two-way spot available. They also signed rookie shooting guard Jared Rhoden and intend to bring in G League point guard Isaiah Miller, who are expected to compete with Pelle for the two-way job.