Di Resta produced what he considered to be the "best drive" of his debut season in the Singapore Grand Prix, finishing sixth.
The 25-year-old Scot has now finished in the points in three of the last four races after coming through a tough run leading up to the midway point of the campaign when luck was not on his side.
But with 18 of his 20 points from those last four grands prix, to move within eight of team-mate Adrian Sutil, the future is starting to appear much clearer for Di Resta.
And Di Resta's manager Anthony Hamilton is hoping to be given a definitive answer from owner Vijay Mallya by the end of next month.
Force India hold an option on Di Resta for 2012, and Hamilton sees no reason why it will not be enforced.
Hamilton said: "Just purely based on his performances, I think he has a seat for next year.
"We've a long-term contract with these guys, they've been loyal to us, we've been loyal to them, and they're a good team to be with.
"So I'm confident they'll re-sign him for a second year, although I have not had any confirmation as yet, but then neither has anybody in the team.
"Naturally we'd all like to know now where we stand, but there are option dates in the contracts, and there is another month or so to go before they can be exercised.
"I'm confident they'll be exercised on the date in question - if they're not then I'll be very upset - but I'm sure everything will work out well for Paul."
Earlier this year Mallya claimed he "would be foolish to let go of a star", and that Di Resta "is worth every penny" of his deal, with Sunday's drive certain to have reinforced that view.
Hamilton, however, concedes that while there are no guarantees, he does "believe in Vijay".
"If you look at Paul's performance in Singapore, I've been more impressed with him this weekend," added Hamilton.
"He had never been to the track before, got on in the first session and was only a couple of tenths behind Adrian.
"He then had a technical issue in the second session and missed virtually all of it, but ran out in qualifying in the top 10, and as for the race, he was superb.
"On that level of performance you can only go forward. It's looking very positive.
"I think everything is looking positive for Paul for next year."