Jack Harvey remains in contention for an IndyCar drive in 2016, but admits he could switch to sportscar racing.
The British driver finished as runner-up in Indy Lights in 2014 and '15, and was pursuing an IndyCar drive with Schmidt Peterson Motorsports.
That drive ultimately went to series returnee Mikhail Aleshin, but Harvey is still chasing funding to advance talks with Bryan Herta Autosport and Dale Coyne Racing.
BHA ran Gabby Chaves last year, while Coyne has filled one of its two full-time 2016 seats with Conor Daly.
"It's progressing," Harvey told Autosport of his push for an IndyCar drive.
"At the same time we were talking with SPM, we were still talking with Bryan and Dale, so for sure it's not a back-up plan.
"Honestly, to end up with any of the teams would be great, they've all shown they can win races and that's what I'm trying to achieve if we can.
"It's a difficult trail and one that probably every driver is on at some point.
"We're not getting down in the dumps about it, we're still trying to progress to the next step, be as positive as we can be and we're hopeful that a bit of hard work and perseverance will pay off."
If an IndyCar opportunity does not materialise, Harvey says his future could lie in sportscar racing, in the World Endurance and/or the IMSA SportsCar Championship.
"When you say it in your head, 'to do WEC is the back-up plan', actually it's not really a back-up plan," he added.
"To do that championship would be amazing. It's not a Plan B, it would be an excellent career move.
"We have some options, I'm told by my management, hopefully we could exercise them quite quickly if we needed to.
"I'm confident that I'll hopefully be racing something in 2016.
"I'd like it to be IndyCar, if not, to race in the WEC and do Le Mans and maybe some IMSA back out in the States.
"That wouldn't be Plan Bs at all, they would be great career opportunities."