The couple are reportedly coming back from the dead to appear in a spoof segment for Children In Need.
According to The Mirror, 71-year-old Bill Tarmey - who played Jack for 31 years before exiting the soap in 2010 - will play the Ghost of Christmas Past in the Christmas Carol-themed skit.
Liz Dawn, 72, who left the Street in 2008 after playing Jack's wife for 25 years, is expected to return as a fellow spirit. However, her appearance in the charity sketch will be dependent on her health, as she suffers with emphysema.
A source said: "Getting Bill Tarmey 'back from the dead' is a stroke of genius."
The role will be the now retired actor's first TV appearance in two years. Prior to his departure, he was the second longest serving male actor in Coronation Street history and was named fans' favourite ever character in an online poll earlier this year.