On Thursday, it was revealed he tore a muscle connecting the left calf to the Achilles tendon.
It is currently unclear when he'll return to the court.
Continue for updates.
Latest on Barea's Timeline to Return
Thursday, Nov. 17
Barea is expected to miss six weeks as he recovers from the tear, per ESPN.com.
Mavericks head coach Rick Carlisle said on Wednesday that it was a strain and that "he'll be out for a while," per Mavericks play-by-play man Mark Followill.
Barea's Emerged as Key Contributor Early in 2016-17
With Deron Williams also nursing a calf issue, Barea has played a more expanded role in the early parts of the 2016-17 season.
Williams looked poised to come back on Wednesday, starting the game against the Celtics, but he left early on due to the nagging calf, per Eddie Sefko of the Dallas Morning News.
Barea started five of his team's first eight games this season and has taken full advantage of the opportunity, averaging 17.3 points and 5.4 assists per game as Dallas' floor general:
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Both of those numbers were on pace for career highs given that the career role player has averaged 8.6 points and 3.5 assists per game over his first 10 seasons in the league.
What's made him so successful is his aggressive style of play. Within a Mavericks offense that lacks dribble penetration, Barea is one of the lone offensive threats who can do so. That helps open up scoring opportunities all over the floor.
With Devin Harris also out with a toe issue, the Mavericks are facing time without any of their point guards available.
That means Seth Curry, Wesley Matthews' backup at the 2, could slot down to the 1 as an emergency starter if needed.
But if he fails to facilitate the offense like Barea has this season, the Mavericks' bad start could grow even worse.
Stats courtesy of Basketball-Reference.com.