The incident will have been a blow to McLaren, having set itself the goal of completing at least 100 laps a day.
The red flag was raised after the crash, suspending the race until the Spaniard's papaya orange and blue MCL33 vehicle was dislodged, reports Efe.
"I'm the one that did most laps in the afternoon", Alonso added. Unveiled the new TR13 to the world this-morning followed by a really positive first day of testing. "We're going to come out pushing, and we're going to be racing as hard as ever".
Toro Rosso Honda vehicle launch with Brendon Hartley.
A year on, with an engine that took former champions Red Bull to three race wins last year, there is much more hope around.
FERNANDO Alonso made an inauspicious start to the Formula One season yesterday, going off the track after losing a wheel on his new McLaren on the first day of testing in Spain.
The Spaniard remained cheerful after an accident that the team blamed on a simple wheel nut and said was no big deal, although he lost about three hours of track time while the damage was dealt with.
"If we're able to develop the key strengths of last year's chassis and marry it to an improved Renault power unit, then I think we'll be able to take a step forwards".
"Obviously it's very early days but the vehicle was running fine, the engine was running fine", he said.
"We had an issue in the vehicle and we lost two hours but you know that there are other guys with your engine running so any information about driveability issues, deployment issues, they will face the same and maybe find a solution", Alonso said. "I thought about all of you!"
"I thought exactly that because this is a very, very small problem", he continued, "but very graphic, very obvious". A auto in the gravel makes a big thing, but there is six teams in the garage with the door closed, with the vehicle in pieces - but there is no picture of that.
"We won't have any troubles", Tost told reporters after presentation of the team's new STR13 vehicle.
"So far, so good", he said.
The test was the first since the introduction of the now mandatory "halo" head protection system and drivers reported no problems with visibility.
Daniel Ricciardo clocked the morning's fastest lap at 1 minute, 20.
"It was a solid start", said Mercedes team principal Toto Wolff.
"When you come back to the auto, you know the solution already thanks to them, so it's a very good position to be in and it's quite helpful".