Juan Pablo Montoya begins IndyCar test return with Penske
Juan Pablo Montoya completed the first test of his Penske IndyCar return at Sebring on Monday
His 2014 team-mate Will Power shook down the car in the early morning before handing over to Montoya - the 1999 CART champion - who managed 20 laps before midday.
The Colombian has not driven an Indycar since 2000, the year he won the Indianapolis 500 for Ganassi.
He has spent the last seven and a half years competing in NASCAR, but confirmed in September that he would quit stock cars and the Ganassi squad to return to IndyCar as part of a three-car full-time Penske entry.
Speaking ahead of the test, Montoya admitted it would take time to reacquaint himself with single seaters.
"Going from stock car to IndyCar, to be 100 per cent will take a little bit of time," Montoya said.
"I think the weird factor will be the first morning, just getting acclimatised.
"There are two sides to testing: one is the excitement of getting in the car, [but] it's also nerve-wracking: it's time to go.
"It will be so exciting because it has tonnes of power, tonnes of grip. Going back to carbon brakes I think will be really exciting."
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