The NBA world was left in shock after Boston Celtics star Kemba Walker sustained what appears to be a neck injury during Friday's showdown against the Denver Nuggets.

Walker collided with teammate Semi Ojeleye during the second quarter of the game and went down the floor. He was immediately stretchered off the arena.

Former and current NBA players quickly took it to Twitter to react to the scary turn of events. The whole league was in solidarity in praying for Kemba amid this concerning time for Boston and their fanbase.

According to the latest report by Adrian Wojnarowski of ESPN, Kemba did not suffer a significant injury. On the team's injury report, the Celtics revealed that they have diagnosed the All-Star point guard with concussion-like symptoms.

It remains to be seen the extent of Kemba's injury, but the Celtics will certainly hope for the best.

Walker has been one of the Celtics' top player this season after he quickly gelled with his new teammates. Prior to Friday's game, he is averaging 22.6 points, 4.9 rebounds and 4.8 assists while shooting 40.5 percent from the field, 39.2 percent from the 3-point line and 91.7 percent from the charity stripe.

The Celtics are already nursing an injury to star forward Gordon Hayward, so another long-term injury to a key player certainly doesn't bode well for the team.