Marcus Smart’s thumb injury still being evaluated [UPDATED]

Add guard Marcus Smart to the list of Boston Celtics afflicted by injury or illness. Both ESPN’s Adrian Wojnarowski and Yahoo’s Shams Charania reported via Twitter this afternoon that Smart sprained his thumb during a loss to the Indiana Pacers Sunday, although Charania added more color to the diagnosis.

Wojnarowski’s report alluded to the scene that took place during Sunday’s game. Smart injured his thumb while chasing a loose ball, a signature effort from the guard with a reputation for hustle plays. He then played through it and amassed a team-high 20 points, along with 8 assists, 7 rebounds, and 4 steals in almost 36 minutes.

The accuracy in the tweet from Charania adds a sense of foreboding, although a slight muscle tear is the definition of strain.

The timeline for Smart’s injury remains unclear.

For now, count Smart along with Kyrie Irving (knee soreness), Al Horford (illness), Jaylen Brown (concussion protocol), and Daniel Theis (torn meniscus).

UPDATE: Earlier this evening, the Boston Herald’s Mark Murphy reported that Celtics General Manager Danny Ainge would not confirm the torn tendon mentioned by Charania.