Celtics roster reset: Lonnie Walker IV likely completes training camp invites

Lonnie Walker IV signed an Exhibit 10 contract with the Celtics to increase their offseason roster to 20 players, including three training camp invites.

That leaves one open spot weeks from the team’s head start before it travels to Abu Dhabi for a pair of exhibitions against the Nuggets, while Boston’s lone remaining standard roster spot unofficially remains unfilled. Walker could eventually fill that spot. For now, it’s no guarantee.

Walker signing with Boston came as some surprise as much as his availability was days before September following a strong shooting season with the Brooklyn Nets. An Exhibit 10 deal could also position Walker IV to begin the year with Maine, as there’s no clear…