Alonso will start Sunday’s IndyCar centerpiece from fifth for McLaren Honda Andretti, and delivered his best F1 qualifying performance of the year by taking seventh on the grid in the Spanish GP earlier this month.

Brown believes that since the deal was agreed shortly before April’s Bahrain Grand Prix weekend, it has had a positive effect on Alonso, who has enjoyed a strong start to the season in terms of extracting the most from an uncompetitive package.

“A lot of driving is mental, and this has put him in such a great frame of mind that I think is very healthy,” Brown told Motorsport.com when asked about the impact on Alonso’s performance in F1.

“He feels good that he’s racing, he’s competitive, he’s getting a lot of attention. He’s not an attention seeker, but it’s got to be fun knowing the world’s watching you race.

“We all work best in a good frame of mind, whatever that job is. This has just got him in a really good place after two years of not being in a good place, as we haven’t.

“It’s had the same effect on the team and partners. It’s just a breath of fresh air.”

Alonso Indy showing has surpassed expectations

Brown says that, while Alonso’s Indy performances so far do not surprise him, the Spaniard has still exceeded expectations.

“It is and it isn’t a surprise, someone of Fernando’s calibre you expect to do what he has done.” said Brown. “However, this place is so difficult and tricky that usually even the world’s best have a bad day. And, knock on wood, he’s not had a bad day yet.

“He’s showing he’s a two-time world champion and further putting a stamp on his greatness. This is only going to make him a better driver.”

Brown added that Alonso has taken to the IndyCar environment well both on and off track.

“He likes it, he’s very settled into the IndyCar way of racing, of fan engagement,” said Brown. “He’s very relaxed and enjoying it. Nothing’s bothering him, he’s just having fun.”