The Boston Celtics have until Oct. 21 to agree on a contract extension with fourth-year wing Jaylen Brown, yet the chance that he will “is pretty slim” in this coming month, according to Sean Deveney of Heavy.com.

Brown is one of the Celtics' most talented players and one with plenty of upside after only three seasons in the league, yet the chances that he becomes a restricted free agent next summer are pretty high. Brown is owed $6.5 million for this season, but upon finishing it the Celtics will still have his rights and be able to match any contract offer that comes his way. They could also simply come to an agreement with each other next summer.

Other players from the 2016 NBA Draft class have signed their long-term extensions, such as Ben Simmons of the Philadelphia 76ers and Jamal Murray of the Denver Nuggets, both netting max-level deals in the range of five years and $170 million.

Brooklyn Nets forward Caris LeVert signed a three-year, $52 million deal in August, which is closer to what the Celtics would be willing to pay for Brown.

The Celtics are already envisioning keeping Jayson Tatum as part of this core, and it would be he who would get the potential nod for a max-level extension of his rookie contract.

Brown averaged 13.0 points and 4.2 rebounds last season, as his role shifted to one of a sixth man, shooting 46.5% from the floor and 34.4% from deep. Since his numbers are closer to LeVert's, a deal within the $17-18 million per year range is most likely what he would fetch as a restricted free agent.