"The driver stated to the stewards that he made the decision to cross the track, trying to avoid the other cars and that he felt this was his best option".
While Grosjean defended his claim that he accelerated across the track to avoid other cars, the stewards thought otherwise.
Grosjean was later hit with a three-place grid penalty by the stewards for the Monaco Grand Prix, after his second non-finish in as a many races.
Steiner added: "Yes, it doesn't look good when you accelerate when are in the middle of the track, but it's a millisecond decision what you need to make and he made the decision to run across".
"Further, in reviewing the video, the stewards found that the vehicle was following the line on the left side of the track and was nearly fully off the track, when he made the decision to cross it".
The 32-year-old Grosjean, now driving for Haas, collided with Nico Hulkenberg and Pierre Gasly after losing control of his vehicle during the opening lap of the race in Barcelona, which was ultimately won by Mercedes' Lewis Hamilton.
Haas boss Guenther Steiner was mid-way through his media session with written media when the decision came through.
Not just that, Grosjean crashed out during the safety auto in Baku, and in Barcelona was given a grid penalty for Monaco for the first corner crash.
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"He went through and he knocked two out".
"If he had stood still, we don't know, maybe he would have knocked five out".
Hulkenberg said: "I got crashed into, Romain spun, came back into the track, I couldn't go anywhere, couldn't avoid him and he took the back end of my vehicle".
"The result was the vehicle drifting right back into the middle of a field of oncoming cars, creating a huge smokescreen for them at the same time, and on one of the fastest, most hard sections of track".
"Obviously, Q3 could've been better and I'm not super happy to start P10 but, in general, I think we're in a good position for the race and I'm happy for the team".
"He spun and it's very unusual to see a vehicle light up its rear wheels like that on the first lap of a race, when there's another 10 cars to come", race director Charlie Whiting told reporters. It's not that he tried to overtake, or brake late, or that he understeered into anybody.
"I don't think there was much I could do". Yes, the consequences were unpleasant, but you only have a few milliseconds to decide - and that's what he decided.
Grosjean's second successive retirement, and third of the season leaves him in 19th place in the drivers' standings, one of two drivers yet to score a point so far, the other being Sergey Sirotkin. Drivers are automatically handed a race ban if they ever reach 12 points over a 12 month period.