The 2021 Coleman medallist's method in front of goals was again in the spotlight as the Blues dropped a second-straight match, going down to St Kilda by 22 points.
McKay wasn't the only culprit for the wayward Blues, but his preference to snap set-shots from long distance was not successful against the Saints.
The giant left-footer missed two snap shots in a minute during a crucial period in the third quarter when Carlton had an opportunity to stay in the contest.
One of McKay's snaps from close to 50m out came off the side of his boot and failed to register a score.
Carlton coach Michael Voss said the Blues would "possibly" review McKay's penchant to snap from almost any spot inside-50.
Voss stressed it was not just McKay who needed to be more ruthless when kicking for goal as the Blues finished with 8.12 against the Saints.
"That's for us to for review and that'd be feedback that he (McKay) needs to evaluate," Voss said of McKay.
"We need to get better in that area.
"I don't think that's just for Harry, that's for us as a footy team, our front half game, and our efficiency around our front half game needs to improve."
Blues teammate Charlie Curnow has started the season superbly with 21 goals to be second in the Coleman Medal race, but McKay has kicked just nine in the first six weeks, with four of those coming against struggling North Melbourne.
"I'm not a predictor of his mindset, so you'd have to probably ask him that question, but I think he's OK," Voss said when asked about McKay's confidence around goals.
"We ask the players to be able to look at their technique and how they finish and keep evaluating and have enough humility to know that if it's not working and what do you need to adjust.
"That's all I ask the players to do, but then go to work on it."
Carlton will head to Perth to play struggling West Coast next week placed seventh on the ladder with a 3-1-2 record.
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