|Irish name||Brian Mac Coisteala|
Abbeyknockmoy, County Galway, Ireland
Costello has played inter-county hurling with Galway's minor, under-21, intermediate and senior teams, having captained the intermediate team in 2008 and was a member of the senior panel in 2009. Costello emigrated to London in 2011 where he linked up with the London senior hurling team. As an inter-county hurler he has won one under-21 all Ireland, one Christy Ring Cup winners' medal and one Nicky Rackard Cup winners' medal.
In 2012 Costello was awarded a GPA All-Star for his contribution to the London Christy Ring winning team. In addition to the All-Star Costello was named the Christy Ring Hurler of the Year.