While the next Ipswich manager betting odds are not yet available, here are some of the other names that could be in the frame should McKenna call time on his spell at the club.
Liam Rosenior fits the profile of being an up-and-coming British coach, which we've already expressed is likely a key requirement for the Ipswich hierarchy. He also ticks the box of having a bit of experience too whilst the fact he’s coached three of Ipswich’s big investments – Jacob Greaves, Jaden Philogene and, if he remains with the club, Liam Delap – will also be a positive.
Many thought Rosenior was harshly treated at Hull after being sacked for narrowly missing out on the Championship playoffs last season and he's now doing a good job in Strasbourg that will enhance his credentials as a coach.
Would the pull of a solid ownership model and sustainable long-term plan to try and establish themselves in the Premier League be enough to get Rosenior out of Ligue 1? We think it would.
Ipswich hiring Liam Manning would send the Bristol City fan base into meltdown, not only because he's doing a stellar job at Ashton Gate but also because many of the Robins supporters are seething with Mark Ashton's success at Portman Road after he left them for his current job. We see a scenario where Manning is poached though.
Manning, a former Ipswich academy prospect and coach, has a style of play that would suit "the Ipswich way", which has brought him some form of success in every role he’s held, and he'd certainly get a grace period from the Ipswich fans.
You can see both parties - Ipswich and Manning - being interested in an appointment but timing is everything and, right now, Manning might steer Bristol City to the Promised Land of the Premier League; that would kill any talk of this happening for the foreseeable.
Like Manning, Matt Bloomfield has strong links to Ipswich having been born locally and joining the academy as youngster before making a handful of senior appearances for the club.
With a good showing as a coach at Colchester and Wycombe, Bloomfield has quickly moved up the pyramid to now have the reigns at Luton. Admittedly, he's not having a great time of things with the Hatters but Ashton and co may well look past that surface issue and see the bigger picture, which is a good young coach that has a strong set of morals - something else that the Blues hierarchy are really focussed on - and a genuine affinity for Ipswich.
Bloomfield would almost definitely jump at the chance if it was offered.
We're not sure this is a likely move but stranger things have happened.
Being Irish, Damien Duff doesn't quite meet the young British manager requirement we've spoken about but he's not too far removed from such a label and certainly he boasts a legacy in the English game and has a real understanding of the leagues here.
A couple of pieces of silverware in Ireland as a manager, along with his playing career in England, make him stand out as a potential candidate for a gig in this country.
If you're looking for other signs of why Ipswich and Duff could happen, you could make a tenuous link between the 46-year-old and Ipswich part-owners "The Three Lions" with Duff's former teammate, and reported friend, Didier Drogba the connection.