Shelley King has landed the role of Kal's mother Yasmeen, while Shameless actor Qasim Akhtar has signed up to play the gym owner's teenage son Zeedan.
Both new arrivals will make their first appearances in the summer, completing the Nazir clan.
Kal, played by Jimi Mistry, joined the cast of Coronation Street late last year and show chiefs later announced their plans to bring in his family.
Marc Anwar is already appearing on screen as Kal's father Sharif, while actress Sair Khan will arrive in Weatherfield next month as Kal's daughter Alya.
Upcoming storylines will see Kal juggling the demands of his extended family, who have been tipped to cause him problems as he tries to settle down with love interest Leanne Tilsley (Jane Danson).
King's previous credits include roles in the TV series Tandoori Nights, West End musical Bombay Dreams and various theatre productions.
Akhtar played Chesney Karib in Shameless between 2007 and 2013.
Digital Spy Soap Scoop video - hit play below for gossip on the Christmas storylines in EastEnders, Coronation Street, Emmerdale and Hollyoaks this year.