Williams drained a step-back, 15-foot fadeaway jumper with 1.7 seconds left that gave the Nets a dramatic 107-105 win over the Minnesota Timberwolves on Tuesday night at the Prudential Center.
Afterward, head coach Avery Johnson announced that Williams will not accompany the team to Detroit for Wednesday night's game against the Pistons. Instead, Williams will see a hand and wrist specialist and undergo an MRI on his strained right wrist.
Depending on how that visit goes, Williams said that there's "probably a possibility" that Tuesday night's game was his last of the season.
Williams said before Tuesday night's game that he thought about sitting out the rest of the season, but decided against it. He's previously said on a number of occasions that the Nets "didn't trade for me to sit."
Williams first suffered the injury back on Jan. 26 when he was a member of the Utah Jazz. It has persisted ever since, and doctors have told him that he'll need three-to-six weeks of rest for his wrist to fully heal.
Williams saw a hand specialist while he was in Utah, and will see another one to determine his course of rehab and get a second opinion.
"We'll see where it goes from there," said Williams, who has been categorized as "day to day." "I want to see what kind of rehab I need to do and not do. And things associated with this injury so I can get back to where it needs to be."
Williams tied a career-high with 21 assists on Tuesday night, but it was the last two of his 18 points that turned out to be the difference in helping the Nets (24-53) double their win total from last season and snap a six-game winning streak.
"It was just a clear-out play for me," Williams said. "I had a couple shots to win games since I've been here. I haven't been able to find it. I'm just happy I could finally get one to go down."
Williams has already missed 12 games this season with the same wrist injury, including a recent six-game stretch from March 20-30. He characterized the 2010-11 campaign as "frustrating."
"I like to play basketball," Williams said. "But it's definitely been a frustrating year and like I said, we were going to take the first three days off and take it day by day and the rest has felt good. I actually hurt it today when Jordan [Farmar] tried to give me a high-five. That's the one time I hurt it today, so it's just been a frustrating year in general. I had those couple weeks off, played a couple games in between, but I had some time off and it started to feel a little better. I look forward to getting it completely healthy in the offseason."
Williams said before the game that his frustrations stem from the fact that he hasn't been able to shoot the ball or finish at the rim with any sort of consistency due to his wrist being hurt.
In 12 games with the Nets, he's shooting just 34.9 percent from the field and 27.1 percent from 3-point range.
"It's just frustrating for me that I can't do the same things I normally do," Williams said. "There's been a couple of games here that I wanted to take over, like I normally do, and I just can't do it. It's been ongoing for a while now.
"I can't finish like I finished before either. I just don't have the same touch. I don't have the same explosion I've had because I haven't done anything. It's not the same, you can't simulate games. You don't practice for two weeks and then play 40 minutes, it's tough to do. You should try it."
Mike Mazzeo is a regular contributor to ESPNNewYork.com.