The Sky Blues welcome Lincoln City to the midlands tomorrow on Legend's Day at the Ricoh Arena.
City head into this one looking to make it two wins on the bounce after Tuesday night's win away at Wycombe.
"That was a difficult game," said Doyle.
"The pitch was frozen over, it was that cold, but it was a great three points to come away with.
"There was a lot of uncertainty going into the game with the weather and we were all wondering if the game would be on. The game was a hard game and there was not an awful lot happening but we got a chance when Tom Bayliss burst into the area and it looked like he was going to score but the lad brought him down and Sparky put away the penalty."
"It was a crutial week. If we would have lost those games then peoople would have told us that our season was over. That was how people would have felt.
"The lads put in a great performance on the back of that. We got ourselves organised at half-time and the manager got it tactically spot-on. We kept two upfront which was brave and it meant us three in the midfield had to work really hard.
"We knew straight after though, as positive as the result was, we were going into a tough game straight after and we had to get better and cut out silly mistakes."
Last season, Doyle lost eleven games on the way to the SkyBet League Two title with Portsmouth - winning eleven of the last thirteen games.
"We are in exactly the same postion as I was in with Pompey last season," he said.
"We won a lot of games but we lost a similar amount to what we have done here. It wasnt expected but we started winning and that was the difference between us getting promoted and not. We kept going and won the league which was great.
He added: "We are trying to get promoted. Not everything is negative. There are a lot of positives. We have conceded a lot of sloppy goals, I noticed that when I was out of the team, and the Mansfield red card was no different.
"This is a crutial game."