He will be supporting West Ham AND his Australian colleague Tony Popovic at the heart of the Palace side after the defender got him a ticket for the game.
"I have got a good mate, Popovic, that plays at Palace, and I am going to be sitting on the fence a bit.
"I will be supporting West Ham because I have a few mates there - but hoping he has a good game as he is a good friend of mine," reveals Hayden.
"It is going to be a one-off game, so it is a tough one to call because both sides have been performing; it could go either way, so let's see what happens on Saturday."
And he is pleased that thanks to Aussie Hammer David Lewis, by dint of his single-handed efforts to get the game shown Down Under when he bought the TV rights to show it, will allow his West Ham supporting friends back home to see the match.
David acquired the rights to the game because it would not otherwise have been shown, and media interest in him doing so has really taken off.
He may now be wondering if it wouldn't have been less exhausting to 'simply' have flown over to Cardiff because he is now enduring a couple of sleepless nights putting the screening of the game in several cities all together.
"He is a flippin' mad Aussie, isn't he?
"I think we are all mad in our own way.
"Good on him, I think it is terrific, and I am sure he will get a big audience in Australia wanting to watch the game.
"There are lot of fans back in Australia and I am sure those pubs back in Sydney and elsewhere will be full to the rafters with the sound of 'Bubbles' being sung.
"I don't know why so many Aussies support West Ham but I think there are West Ham fans all over the world.
"It is the club everyone likes to support - a traditional English club - and I don't think the support for West Ham will ever change."
So while David cuts through the red tape at home - 'should I or shouldn't I hire the Olympic stadium and be done with it?' - Hayden, whose move to West Ham was hampered by bureaucracy, continues his rehabilitation with Pompey after sustaining a nasty injury this campaign.
"The season has been terrific; the main thing for Portsmouth was to survive and had they come fourth from last, so be it.
"I broke a foot just before Christmas time so I had to have three screws put in during an operation and I will not be back until September or October - it is a shame, but that is football."
But back to the Hammers - does he keep in touch with any of the boys?
"I speak to them every now and then; I enjoyed my time at West Ham but unfortunately I had to leave," he says.
"It is a great club with a lot of history - and everyone made me feel more than welcome.
"Unfortunately it didn't work out, but I still follow what all the boys are doing.
"It is good to see they are in the play-off final, so let's hope they can get back into the Premiership where they belong."
At this stage, David expects the venues will be two in Sydney and one in each of Brisbane, Cairns, Melbourne, Adelaide and Perth.
Viewing will be restricted to specific venues, namely:
The Sydney Aussie Rules Social Club, 28 Darlinghurst Rd Kings Cross 2011 (capacity 400)
Scruffy Murphy's, 43 -49 Goulburn St (Cnr of George St) Sydney 2000 (capacity 170)
Sluggers Bar (Function room) at the Windsor Hotel, 112 Mill Point Rd South Perth 6151. (capacity 500)
The Celtic Club, 316 -320 Queen St Melbourne 3000 (capacity 350)
The Pig 'N' Whistle (Riverside), Shop 20 Riverside Centre, 123 Eagle St Brisbane 4001 (capacity 400)
To be confirmed
To be confirmed
Any alterations to this will be notified here.