The Leeds-based Scot, who has been out injured for almost four months, admits he is still battling back to full fitness following a low-key comeback last weekend in a club meeting in France, and he has set his sights on using next month's European Championships in Austria to sharpen himself up for Glasgow.
"The race in France went better than I expected, so I should be all okay for Glasgow," he said. "It gets better each week, which makes life easier. I ended up 17th, not great but, for the first race back, I was happy."
Brothers Alistair and Jonny Brownlee will bid to bounce back into contention in Hyde Park after both missed the podium earlier this month in Yokohama, and although Stirling-based duo Grant Sheldon and Marc Austin are sitting out the event, McNamee believes the youngsters have earned their place in Scotland's Commonwealth squad.
"They are getting too close for comfort," he added. "But it's nice to see, though. It's about time I wasn't the only one."
England's Jodie Stimpson will defend her spot at the top of the women's world rankings in London despite a foot injury in the previous round in Yokohama, which required five stitches. But Nairn-born Helen Jenkins, the former world champion, believes she can mount a challenge as she gears up for Glasgow.
"I've been really pleased with how this year has gone so far and I'm just really pleased to be able to train and race," she said. "My training isn't geared to sprint races particularly, but my plan is to enjoy this one with the home support and see what happens."
Scottish pair Jane Egan and Alison Patrick will compete this morning in the Para-Triathlon.