Dan Bourke will be out for a period after picking up a suspected dislocated shoulder.
In the Offaly Senior Hurling Championship, Ballinamere survived a late fightback to emerge with their 100% record intact.
Last year's beaten quarter finalists ran out 1-22 to 0-21 winners in front of a sizeable home crowd.
Sean Treacy's side will have to do without Dan Bourke for the championship's coming games.
The forward suffered a suspected dislocated shoulder and is expected to be sidelined for the next month at least.
Brian Duignan top scored for the home side with 1-6, while Shane Dooley hit 0-14 for Tullamore, with 13 from frees and 65s.
Treacy says his side leaned on their experienced players to get a second win of the campaign:
You can listen to the Ballinamere's full interview with Midlands 103's David Hollywood here:
Ballinamere return to action against Shinrone in just under two week's time.
Our coverage of Offaly GAA is with thanks to Leahy Midland Auctioneers & BER Assessors, if you're thinking of selling or buying a property or need an energy rating then get in touch with John - visit leahyauctioneers.ie
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