The Toronto Raptors appear to be on the verge of locking up a key part of their future.
However, it'll take a maximum contract offer to secure Siakam's signature, league sources told Haynes.
The 27th overall pick in the 2016 NBA Draft is eligible to receive a five-year, $170-million deal from Toronto, whereas other teams can extend a maximum offer of four years and $130 million.
Ben Simmons of the Philadelphia 76ers and Jamal Murray of the Denver Nuggets are the only players from Siakam's draft class who have received max contract extensions.
Siakam, 25, is set to make $2.3 million this season.
He's coming off a breakthrough 2018-19 campaign in which he posted career highs in points (16.9), rebounds (6.9), and 3-point percentage (36.9%) en route to winning the NBA's Most Improved Player Award. The Cameroonian's emergence as a secondary offensive option helped the Raptors earn their first NBA championship this past season.