Both sides have had their relegation from the Premier League sealed, but there are still a few things at stake at the King Power Stadium.
With both teams locked on 22 points, there is a battle to finish best of the bottom three and claim an extra £2.8m in prize money.
Town getting revenge for a controversial 1-1 draw at Portman Road last November is another factor, while Foxes legend Jamie Vardy playing his final game for the club provides a juicy narrative.
Asked if winning could provide an psychological boost ahead of the teams doing battle in the Championship next season, McKenna said: "We're not looking at it like that, to be honest. Whenever we play again, whether it's in August or December, both teams are going to have new players. It'll be in a completely different context.
"I think and believe we'll both be at a very different end of a table and I don't think we'll be looking back on this game now as much evidence for anything.
"It's just about this season. Both teams are really desperate to finish off well. We know that if we manage to win the game, then it's very likely that we'll finish above them. That's the aim. We're 18th and we're going to have to work hard over the next two games to try and stay there. That's one clear motivation going into the weekend."
Back in early November, Town were on course to secure their first win of the season when 1-0 up against Leicester at Portman Road courtesy of Leif Davis' fine volleyed finish. Referee Tim Robinson failed to spot a clear barge on Conor Chaplin in the box though and subsequently dismissed Kalvin Phillips for a harsh-looking second yellow card. Leicester went on to snatch a stoppage-time equaliser and Ipswich went another eight matches before securing their first league victory on Suffolk soil.
"When we reflect on things that will frustrate a little bit going into the summer, that game is one of them," admitted McKenna.
"I think we were the better side on the day, we were pleased with a lot of aspects of the performance and it was a decision that cost us. But for a decision that wouldn't happen many times out of 10, we win the game.
"It would have been good to get that home win a little bit earlier than what we did. It is what it is. That's in the past. The motivation is there for Sunday, irrespective of that, to be honest."
Asked if a win in that game could have altered the path of the season, McKenna replied: "Look, there's always going to be lots of those moments, not just on the pitch, but with signings and injuries and everything that can alter the course of the season.
"I feel like we've had maybe more than our share of really close things going against us in different ways. That game was certainly one of the big ones.
"But we always want to take ownership and accountability of what we can affect. We don't like referring to 'luck' or anything like that. It's always about what we can do better.
"A lot of that game was influenced by one decision, but we'll still look at our management of it and our execution in certain situations and our game management, even with 10 men, to see the game out.
"But, yes, there's been quite a lot of margins that, played over again, could have gone our way. I don't think we've managed to win many points really that have been undeserved or had things that have thoroughly gone for us.
"As I say, it is what it is. We can only change the future and learn from all those lessons and be stronger for them."
Leicester sacked Steve Cooper in late November and replaced him with Ruud van Nistelrooy. Results got worse and the Foxes recently failed to score in nine successive home games before ending that run with a 2-0 win against rock-bottom Southampton.
"I think they've been pretty consistent," said McKenna, when asked how much Sunday's opponents have changed under new management.
"Some of the best stuff they do now under Ruud is still some of the best stuff they did under Steve Cooper and also last year.
"They've got a good structure with the ball. Certainly in the second phase, when they're in controlled possession, they've got some really good patterns of play and some really good connections through the pitch.
"Of course, everyone puts their own slant and take on different details.