Allen appeared in 38 games for the Grizzlies during the 2019-20 season -- his second in the league. The Duke product set career highs essentially across the board, averaging 8.7 points, 2.2 rebounds and 1.4 assists in 18.9 minutes. He also shot 46.6 percent from the field, 40.4 percent from three and 86.7 percent from the free-throw line. During the fourth game of the season, Oct. 29 against the Lakers, Allen had his first of 16 double-digit scoring outings of the season. In that contest, he played 21 minutes and recorded 13 points, five rebounds, a season-high two steals and one assist. On Dec. 4 against the Bulls, Allen set a season-high seven rebounds in 25 minutes. He set a season-high four assists during a win over the Rockets on Jan. 14. Following the league's hiatus due to COVID-19, the Grizzlies were one of 22 teams invited to participate in the restart in the Orlando bubble. Allen saw his role increase substantially and, in seeding play, he averaged 13.6 points, 2.4 rebounds and 1.1 assists while shooting 50.7 percent from the field, 48.0 percent from three and 90.0 percent from the charity stripe. During those seeding games, the 6-foot-4 guard scored a season-high 20 points on two separate occasions. The better of those performances was Aug. 5 against the Jazz, where he shot 7-of-10 from the field and 6-of-8 from three while also racking up two rebounds and one assist in 27 minutes.2018
After being selected with the 21st pick in the NBA draft, Allen joined the Utah Jazz. He played in 38 games and made two starts during the season. Allen averaged 5.6 points per game during his rookie campaign. He scored a career-high 30 points against the Clippers on Apr. 10. The same game also saw him set highs for rebounds (seven), made three-point field goals (five), made field goals (11) and minutes played (40:43). Allen finished with double digit points in four other games. As a rookie, he spent time in the G-League with the Salt Lake City Stars. At that level, he scored 16.3 points per game and made 12 starts. In the postseason, Allen played in two games in the series against the Houston Rockets. And in the second game, he went on to notch nine points.
June 21, 2018Drafted by the Utah Jazz in the 1st round (21st pick) of the 2018 NBA Draft.
July 2, 2018Signed a rookie two-year contract with the Utah Jazz
July 6, 2019Traded by the Utah Jazz with Darius Bazley, Jae Crowder, Kyle Korver and a 2020 1st round draft pick to the Memphis Grizzlies for Mike Conley.
December 16, 2020Grizzlies exercised $4.05 million team option for 2021-22.