Helio Castroneves has avoided serious injury after almost being struck in the head by the airborne IndyCar of Alexander Rossi following a collision in the pit-lane at Pocono.

The incident occurred when Indy 500 winner Rossi was released from his pit box and made contact with Charlie Kimball as he was coming in for his stop. Causing Rossi's Team Penske car to get airborne, he would proceed to clatter into team-mate Castroneves as he came out of his pit box.

Glancing the Brazilian's helmet, despite the potential seriousness of the incident - which can be viewed below - Castroneves insists it looked worse than it was.

"I was more protected than it looked," he said. "IndyCar have worked so hard on safety and it was proven today. I'll take some Advil and I'll be OK."

Former F1 driver Rossi, meanwhile, says the incident was an unfortunate one and was simply pleased Castroneves escaped a more serious injury.

"Everyone is going to have their own opinion, but I was staying in the slow lane. Kimball was obviously trying to come in his box, but then Helio was being released, so I don't know. It's very unfortunate. This car was awesome today."

The accident comes a year after Justin Wilson was killed at the same venue when he was struck by debris at racing speed.