Memphis Grizzlies point guard Ja Morant will miss the next three to five weeks rehabilitating a sprained left ankle.

The team confirmed on Tuesday that last season's Rookie of the Year will miss extended time after suffering the injury in Monday's 116-111 overtime win over the Brooklyn Nets.

In the second quarter, Morant jumped to block a shot and landed awkwardly on the foot of Nets guard Timothe Luwawu-Cabarrot. He immediately hobbled to the sidelines in pain and was escorted to the locker room in a wheelchair. 

Although X-rays showed no fractures, further testing revealed a grade two sprain. 

The second overall draft pick in 2019, Morant is coming off a sterling rookie campaign during which he averaged 17.8 points and 7.3 assists, shot 47.7 per cent and helped energise Memphis to compete for a playoff spot in the Disney campus bubble.

The 6ft 3in guard was off to a red-hot start this season, scoring 44 points and providing nine assists in the Grizzlies' season-opening loss to the San Antonio Spurs on December. 23. He followed that with a 28-point game against the Atlanta Hawks on Boxing Day. 

If Morant's prognosis holds true, he will miss somewhere between 11 and 19 games. 

Dillon Brooks and Tyus Jones are among the candidates to spend more time at the lead guard spot until Morant is fully healthy.