ork ▁City , ▁it ▁was ▁announced ▁on ▁ 9 ▁July ▁that ▁O ' Call ag han , ▁along ▁with ▁ex - te amm ate ▁Bas ▁Sav age , ▁had ▁joined ▁T ran m ere ▁Ro vers ▁on ▁a ▁two - year ▁contract . ▁However , ▁on ▁ 1 3 ▁February ▁ 2 0 0 9 , ▁O ' Call ag han ▁had ▁his ▁contract ▁cancel led ▁by ▁T ran m ere ▁Ro vers ▁after ▁suffering ▁ill ness ▁and ▁failing ▁to ▁sett le ▁at ▁the ▁club . ▁Return ing ▁to ▁his ▁native ▁Ireland , ▁O ' Call ag han ▁signed ▁for ▁D und alk ▁in ▁February ▁ 2 0 0 9 , ▁scoring ▁against ▁C elt ic ▁on ▁his ▁debut . ▁He ▁left ▁the ▁club ▁after ▁just ▁four ▁months . ▁ ▁In ▁July ▁ 2 0 0 9 , ▁English ▁club ▁Ye ov il ▁Town ▁confirmed ▁won ▁O ' Call ag han ' s ▁signature . ▁On ▁ 2 3 ▁December ▁ 2 0 0 9 ▁it ▁was ▁announced ▁that ▁his ▁contract ▁would ▁not ▁be ▁renew ed , ▁after ▁seven ▁starts ▁and ▁five ▁substitute ▁appearances ▁in ▁six ▁months , ▁leaving ▁him ▁without ▁a ▁club . ▁He ▁returned ▁to ▁C ork ▁City ▁for ▁a ▁third ▁time ▁under ▁new ▁b oss ▁Rod dy ▁Collins . ▁After ▁the ▁departure ▁of ▁Dan ▁Murray , ▁he ▁was ▁named ▁captain . ▁O ' Call ag han ▁and ▁the ▁rest ▁of ▁the ▁staff ▁of ▁the ▁club ▁became ▁free ▁agents ▁after ▁the ▁w inding ▁up ▁of ▁the ▁club ▁in ▁February ▁ 2