Celtics center Aron Baynes is set to enter unrestricted free agency July 1, but "multiple league sources" expect the Australian big man to sign a "multiyear deal" to stay in Boston.

"(The 2017-18 season) was the first in which the fifth-year pro played an integral part for one of the better teams in the NBA," A. Sherrod Blakely of NBC Sports Boston wrote Tuesday. "And it's a role that multiple league sources believe will continue, as they expect the Celtics to sign the veteran big man to a multiyear deal."

Baynes signed a one-year, $4.2 million deal with the Celtics after declining his $6.5 million player option with Detroit last summer.

He started 67 regular season games for the Celtics and was in the team's starting lineup in 12 of 19 postseason games.

The 31-year-old Baynes averaged 6 points per game last season and set career-highs in rebounds (5.4) and minutes per game (18.3).

He provided Boston with a physical presence and tough interior defense, leading the team in defensive rating (97.0) last season.