Allen, who was selected 53rd overall in the 2017 draft by the Celtics, spent his rookie season on a two-way contract with Boston, but was waived by the club earlier this month.
While he only played sparingly in 18 games for the C’s in 2017/18, Allen had a strong showing for the Maine Red Claws in the G League, averaging 17.7 PPG, 5.5 RPG, 4.9 APG, and 2.2 SPG in 34 contests. The 25-year-old was also named to the NBAGL All-Defensive team.
Terms of Allen’s new deal aren’t yet known, but a training camp contract with little to no guaranteed money seems likely. Having signed Noah Vonleh already this week, the Knicks now have 19 players under contract — 17 on NBA deals and two more on two-way pacts. Teams can carry up to 20 players on their rosters during the offseason.