Quartet return for Republic
Four players who missed the Republic of Ireland's last two Euro 2012 qualifiers have been included in a 26-man provisional squad ahead of the games against Russia and Slovakia.
Duff, 31, Treacy and O'Dea have been back in action for their clubs Fulham, Preston and Ipswich respectively but Andrews has yet to return for Blackburn.
Republic of Ireland manager Giovanni Trapattoni has also included CSKA Sofia striker Cillian Sheridan again.
The 21-year-old former Celtic player was drafted into the squad ahead of the last two internationals following the injury withdrawals.
Trapattoni warned that Russia and Slovakia remain the Republic's biggest rivals.
He said: "We go into these qualifiers with six points from six in the opening games of the campaign in September.
"We performed well against Armenia and Andorra and we will build on these good results in our next games against Russia and Slovakia.
"These teams are the top seeds in the group and they will be looking to take three points from us to kickstart their Euro campaigns.
"But we have prepared well and will not make it easy for them as we continue to lay the foundations to qualify for the European Championship finals."
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