A probable extension between Grant Williams and the Boston Celtics “are at an impasse,” sources told HoopsHype’s Mike Scotto.

Per Scotto, a $14-15 million yearly salary range could push Williams to agree to a deal, but the Celtics appear unlikely to reach that amount as the Oct. 17 deadline looms.

Once Williams gets unsigned for a rookie-scale extension, he’ll hit the next offseason’s summer as a restricted free agent.

Drafted by the Celtics for the 22nd pick of the 2019 NBA Draft, Williams steadily improved himself throughout the years as a bruising wing. He averaged career-highs in points (7.8), boards (3.6), and three-point percentage (41.1 percent) in the previous basketball year.

As one of the best title contenders in the league, Williams’ long-term stay will stand integral for the Cs’ eventual success moving forward.