Back after two games out with a hamstring problem, Austin headed home in injury-time to give Rangers their first win in four Sky Bet Championship matches.
It was his 12th goal of the season and manager Harry Redknapp is determined to sign at least one forward - preferably from the Barclays Premier League - to play alongside him.
And Bond said: "We need help in that department and Charlie needs help, but he's coming up trumps for us. He is under pressure to score.
"I think in an ideal world, Harry wouldn't want to take a big chance and would like to bring in someone he knows can do a job.
"If you get someone in from abroad it can be more of a risk, but that's not to say that if the circumstances were right he wouldn't take someone from abroad, because I'm sure he would.
"He's looking at the options available to him and hopefully, before the transfer window closes, something can be done."
Austin headed in Danny Simpson's cross after substitute Matt Phillips had poked in an equaliser from close range 10 minutes into the second half.
Doncaster had gone ahead through Theo Robinson's cool finish two minutes before the interval.
Bond added: "Yes it was very pleasing, but we made hard work of it. The result was so important on the back of a difficult time for us.
"In fairness, the lads showed a lot of spirit to come from behind. I thought Doncaster were excellent and gave us a lot of problems in the first half, forcing us to change the way we play.
"We weren't really at the races in the first half, but competed more in the second and got the winner - a great, great winner - from Charlie."
Doncaster boss Paul Dickov, who felt his team should have been awarded a second-half penalty for a foul on Richie Wellens, insisted they could take heart from their display.
Dickov said: "We're all a bit deflated at the moment. We put in a fantastic performance from start to finish and lost the game.
"Never mind not getting a point, I felt we were unlucky not to get all three against the best team in the division.
"The football we played was top class and when we didn't have the ball there was a real desire to press.
"I've got to give the players a lot of credit. We're a bit down at the minute but we've got to take massive positives from the performance.
"It's hard to take positives after a result like that, but we've shown we can really compete in this league, and I just want to keep the players believing.
"I feel we have a good squad and if we keep performing like that we'll be all right. I'm confident about that."