Dublin GAA say they have been unsuccessful in their attempts to see Ger Brennan's ban overturned.
The football boss was suspended for 12 weeks following his clash with a member of Galway's backroom staff during a league game last month.
He appealed the case to the Disputes Resolution Authority who met this morning but ruled against the All Ireland winner.
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It means Dean Rock will take the team for tomorrow's Leinster football game against Wicklow.
Brennan will also miss the opening two games of their Sam Maguire campaign.
