Former Barcelona goalkeeper Victor Valdes is training with Manchester United as he recovers from a serious knee injury.
Crystal Palace defenders Damien Delaney and Joel Ward have yet to agree new deals at the club.
Heidar Helguson and Stephen McPhail will leave the club as expected when their contracts expire on June 30th 2013, but McNaughton has the option of extending his stay at the Cardiff City Stadium.
The newly-promoted Bluebirds have released Elliott Parish, Nat Jarvis and Jesse Darko, while Adedeji Oshilaja and Ronnie Hawkins have been offered deals, and an option has been excercised to retain promising full-back Luke Coulson.
Six of the Club's apprentices have been offered professional deals after graduating through the Cardiff City Academy - Dane Griffiths, Gethyn Hill, Kane Owen, David Richards, Theo Wharton, Josh Yorwerth.
In addition, Tommy O'Sullivan has been offered a professional deal with a year left to run on his apprentice agreement.