The Sky Blues continued their winning home form as they defeated Exeter City at the Ricoh...
Devon Kelly-Evans confirmed the three points on his first league start after an own goal had given City a second half lead.
The youngster was a late replacement for the injured Stuart Beavon and impressed the defender.
"I think it is starting to come together in terms of results. Last week we were probably the better team against Cambridge and didn't get the result, but today we deservedly did," McDonald said.
"It's football, so you expect changes can happen. That is the reason we have a good squad here, every player can come in and do a job for us.
"Devon was terrific today, he's put himself in a strong position to hold onto his shirt for Tuesday in my opinion, but he's got to keep doing what he is doing."
The Sky Blues registered yet another clean sheet, making it six shut outs in just nine League Two fixtures so far this campaign.
Mark Robins' side allowed the league leaders just one shot on target during an impressive display on Saturday.
"I think our back four is one of, if not the best in the league so we have to keep producing these kind of performances.
"It doesn't matter who we're playing, home or away, we have to continue performances like that and we'll be very hard to defeat this season,"
He added: "I think the belief has always been there from day one. The players signed all knew what the target was and the the whole squad is moving in the same direction."