It looks like the Boston Celtics will not have Kemba Walker available for Sunday night's Game 4 against the Brooklyn Nets, according to SNY's Ian Begley.

Walker is listed as questionable due to a left knee bone bruise, but the injury apparently didn't respond well to workouts on Sunday morning.

The veteran point guard struggled mightily in the Celtics' 125-119 Game 3 victory over Brooklyn. Walker had just six points on 3-of-14 shooting overall and 0-of-7 from 3-point range. He also had five turnovers as Boston was outscored by 15 points in his 34 minutes on the court. The Celtics won mostly thanks to Jayson Tatum's 50-point outburst.

Walker has struggled with his shooting all series. He's at just 31.7% from the field and 3-of-17 on 3-point shots. The Celtics guard came into the playoffs finally in a groove after he struggled for much of the season. Injuries have hampered the veteran for the last couple of years, with knee problems being especially detrimental to his success.

With Walker set to miss Game 4, Boston is going to need another miracle in order to upset Brooklyn once again. Tatum will have to be masterful, and all hands available will need to be on deck.

Unfortunately, Celtics center Robert Williams also isn't expected to play. Williams has been dealing with some nagging injuries of late.