McKay played in his side upset win over Geelong last round, but is reportedly set to miss this week as he battles soreness.
Earlier in the week, Carlton coach David Teague spoke to SEN Breakfast about the output of his forward line in the Round 3 win.
“[The forward line is] still learning and Cameron Bruce has been doing a really good job with them in terms of educating them,” Teague said.
“We went down to Geelong and we really wanted to isolate their key defenders one-on-one and to do that you need the three talls to keep apart and I thought they did that really well and we saw the results.”
Carlton’s injury list is small, with only McKay, Zach Fisher, Caleb Marchbank and Paddy Dow unavailable for selection.
Fisher is recovering from an ankle injury and is not expected to play for at least another week, while both Marchbank and Dow are recovering knee injuries and remain a few weeks away from being fully fit.