Portlaoise Leisure Centre closed last June with the loss of 30 jobs.
Portarlington Leisure Centre will take over the running of its sister centre in Portlaoise.
It closed last June with the loss of 30 jobs and will reopen when restrictions are lifted and renovation works are completed, probably in mid-July.
It's expected the pitches will open first, followed by the gym and then the pool.
An agreement reached at the weekend between the local authority and the board of the Portarlington facility will see one manager and board, a shared workforce and a flexible-ticket for users.
Board member and Fianna Fáil rep Pádraig Fleming says the merger was essential to ensure the viability of the two centres: