The life-saving service has been at risk of closure several times in recent years but following extensive lobbying from Mr Durkan others the service has been awarded almost £500,000.
Said the Foyle MLA: “I welcome this much needed and very welcome investment for this hard-won service in the heart of our city.
“The SDLP were integral in setting up this service and have been to the fore in the fight to save it.
“The service has had to fight tooth and nail, each quarter for every penny it gets. I’ve no doubt that confirmation of three years funding will come as a huge relief to staff and to many people within the city.
“Unfortunately, in recent weeks our city has witnessed the profound and evident need for a crisis intervention service here.
“It will continue to play a critical role in the months ahead during the COVID recovery period.
“This service is sadly but badly needed in Derry – it was hard won by citizens here who have fought to keep its doors open ever since.
“It goes without saying, the volunteers and staff at Extern have carried out sterling work to date, particularly during such a difficult period and in the face of uncertainty.
“They continue to have my utmost respect and admiration,’ added Mr Durkan.