Tomás Ó Sé feels both Armagh and Derry may lack at the attacking options to win Sam Maguire this season.
On Sunday, the two sides played out an enthralling Ulster final which ended in a 3-1 penalty shootout victory for Derry. It's the first time that Derry have won back-to-back provincial titles since 1976.
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"My issue with both, and this might sound too simplistic," Kerry legend Ó Sé told the RTÉ GAA podcast.
"Before the game yesterday, James Morgan and Barry McCambridge, came on for Ben Crealy and Stefan Campbell.
"My issue with them is when they against the Dublins, the Kerrys, the Galways, the Mayos, they are able to soak up and compete with mass defences at this stage. It doesn't choke them like it once used to.
"All those top teams have top forwards who can cause damage. Armagh in the first half [against Derry] had plenty of ball and plenty of time on the ball. It's breaking down defences."
Shane McGuigan scored seven points for Derry on Sunday with four of those coming from play.
'That's the one area I think Armagh and Derry might stumble'
"Would Derry have won that game yesterday without Shane McGuigan? They wouldn't," said Ó Sé.
"The bigger teams are able to choke Shane McGuigan out of a game. Yes, they have attacking defenders as good as anywhere in the country.
"My issue or worry for Armagh and Derry... Don't get me wrong, they could take out a big team, they could take out a Kerry, take out a Dublin.
"Winning an All-Ireland, you always have to bank on fellas getting you over the line scoring-wise. That's the one area I think they might stumble on as they go down the straight. "