Mr Mathews, a rugby and cricket enthusiast, died suddenly at the Black Crook Clinic on Tuesday.
Dewey, a former rugby player, was 60 years old.
The Portdown Rugby Football Club said: “It is with great sadness that we announce the death of our dear friend Davey Mathews. There was a big character.
Davy moved from Lurgan to the club to play U20 in the 1980s but soon became a fixture in the 1st XV with a strong second-row partnership with Ernie Ligget, both played well until the mid-1990s. ۔
“He was a strong and uncompromising stalwart who had no absurdity on the pitch that made him like his teammates and supporters alike.
“Dewey can be very convincing and is often the first to reassure passionate members of the opposition, and many young players point out how Dewey kept his arms around him to guide him safely in his early career. ۔
“Outside the field, there were big laughter, smiles and mischievous eyes that we all loved and remember well.
“There are so many stories to tell, matches, tours, creeks and everlasting friendships.
“Those who enjoyed the joy of his company will surely remember the stories and memories that came together in the days and weeks to come.”
“Our thoughts are with Pamela, the boys, her brothers and the rest of the family at this difficult time.”
The Donacloney Mill Cricket Club is saddened by the sudden death of our friend and member Davy Mathews.
“Dewey was an ardent supporter of the club and enjoyed watching club matches at all levels in the afternoon.
“Our sincere condolences to his family in this hour of grief, especially to his brother Remy and nephew Ryan.”
Polk Park Sport said: “We are devastated to learn of his sudden death or of former Lorgan rugby player and friend Davey Mathews.
“Dewey was an absolute gentleman and he has fond memories of those who played with him many years ago.
“Our thoughts and prayers are with Davey’s wife, Pamela, his two sons and their brothers, and Remy, Brian and former Lorgan players, and their families.”
The Spirit of 2014 Glenavon Supporters Club said: “Davy loved ‘The Spirit’ and #GlenavonFC, but there was nothing more loving and proud of him for his family. An absolute noble man. Will be remembered
“We will try to keep Dewey’s ‘soul’ alive as long as we stand on the roofs and offer our full support to Remy and the whole family in this hour of grief.”
Sainsbury’s Craigavon will close the store in a matter of weeks, leaving 97 jobs.