The Dublin camp has been rocked by claims that Donegal forward Paddy McBrearty was bitten during the first half of last Sunday's Ballybofey stalemate, with county board chairman Andy Kettle stating on the record last Tuesday that "I don't accept that something did happen".
Yesterday, when asked about the controversy, McMahon told FM104: "I'm sure there's enough authority in both counties to - if something happened - they'd sort it out.
"But I honestly don't know what happened. I've heard allegations, but as I said I don't know what's going on with it and what's going to happen from it."
LONG-TERM absentees Dermot Earley and Brian Flanagan are the only definite non-starters for Kildare as Kieran McGeeney ponders his Lilywhite line-up for this Sunday's NFL Division One semi-final against Tyrone (2.0).
McGeeney has said that he won't be resting his U21 contingent ahead of their All-Ireland semi-final against Galway six days later. A team spokesperson also indicated that Emmet Bolton (who missed the Down game through illness), Mikey Conway (knee), Ronan Sweeney (calf) and Morgan O'Flaherty (virus) should all be available.
The same also applies to comeback midfielder Daryl Flynn who, having battled back from a serious groin injury, played in Newry last Sunday.
Even if the Lilywhites advance past Tyrone, however, there's no chance of either Earley or Flanagan playing any part in the final.
At this stage both will struggle to be fit for Kildare's Leinster SFC opener against Offaly on June 1. Flanagan, who started the year impressively in a new half-forward role, has missed the past month with a knee injury. He damaged his posterior cruciate ligament, but surgery was not required and he was due off crutches this week.