It's a crucial afternoon ahead in the 'Group of Death' in the All-Ireland Senior Football Championship.
Derry and Galway go into their 2pm clash at Celtic Park with both teams knowing they can't afford a loss after opening day defeats.
Derry's only win in nine matches this year was against today's opponents in the National Football League.
Croke Park is the venue for the first Championship meeting of Dublin and Armagh since 2010 at 4pm.
Con O'Callaghan misses out through injury for Dublin while All-Ireland champions Armagh have made just one change from their win against Derry, with Oisin O'Neill in for Conor Turbitt.
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Donegal will look to get their campaign back on track in Group One.
Jim McGuinness' Ulster champions make the trip to a Cavan team who won at Mayo in their opening match.
While Monaghan will be aiming to make in two wins from two when they welcome Clare to Clones in Group 3 at 4pm.
Mayo have boosted their chances of qualifying for the knock-out stages of the All-Ireland Senior Football Championship.
Goals in either half from Darren McHale and Ryan O'Donoghue have given them a 2-17 to 1-13 victory away to Tyrone.
Down survived a fight-back from Louth to edge their encounter by 25-points to 24 and it finished level between Roscommon and Meath.
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Limerick and Wicklow have qualified for the quarter-finals of the Tailteann Cup.
Division Four champions Limerick topped Group Three after a 19-points to 18 win against Westmeath in Portlaoise.
Oisin McConville's Wicklow secured top spot in Group Two with a comfortable 3-29 to 21-points victory over Waterford.
