Washington Wizards forward Kevin Seraphin wore a black T-shirt with the phrase written in white in all caps before Friday night's game against the Chicago Bulls.
"Je Suis Charlie" — "I Am Charlie" in English — has become a worldwide slogan to show solidarity with Charlie Hebdo, a Paris weekly newspaper where 12 people were killed Wednesday in a terrorist attack.
Seraphin was born in French Guiana and has represented France in international competitions.
Bulls forward Joakim Noah noticed the T-shirt and gave Seraphin an approving chest-tap at midcourt. Noah is the son of French tennis champion Yannick Noah.
French-born forward Nicolas Batum of the Portland Trail Blazers wore a similar shirt before Thursday's game against the Miami Heat.