Darren Ferguson admitted he had taken a gamble signing Paul Taylor after he earned Peterborough a 2-2 draw against Millwall.
The striker was handed a six-month FA ban three years ago while playing for Chester for failing a drugs test but is now showing signs of maturity.
Ferguson signed the 23-year-old from Anderlecht at the end of last season and was rewarded with Taylor's first goal for Posh as he completed a sensational comeback from two goals down.
"He's been playing in Belgium, we knew him from Chester, he's had a tarnished past and we've taken a punt on him," said Ferguson.
"I don't mind taking a chance on people and he's been superb since he came into the building. He's got his head down and done well.
"We've had to get him up to our fitness levels, it's his first real pre-season, but he's got unbelievable ability. The boy's got a chance."
It all looked so different for the visitors when Liam Trotter broke goalkeeper Paul Jones' resistance by sidefooting Millwall ahead after 32 minutes.
And they appeared dead and buried when Hameur Bouazza collected Darius Henderson's pass and doubled their advantage after the break.
But Taylor came off the bench in the 55th minute, and a quarter of an hour later he set up Lee Frecklington to pull one back.
And moments after Trotter had hit a post for the Lions, Taylor completed the comeback with a low 20-yard strike.
"We've shown our character again," added Ferguson.
"I don't think many teams will come back from 2-0 down at Millwall, I have to praise the players for coming back to take a point.
"You have to be strong mentally here, it's a very intimidating place.
"I know my players, they are never down and out and I've got players who can change games. Freck scored a great a goal and then Taylor grabbed one."
Victory would have seen Millwall, who just missed out on the play-offs last season, climb to fourth.
They remain unbeaten but boss Kenny Jackett was frustrated at seeing them blow a two-goal lead for the second time this term.
"It's disappointing because we looked in a strong position and had a number of chances to put the game away," he said.
"Their keeper made a couple of good saves, and at 2-1 up he's touched one onto the post, and they've gone down the other end and scored.
"Ultimately we are frustrated we haven't seen it through.
"But we are unbeaten and there is a lot in the first few games to build our season upon."