HITC Sport understands a number of clubs are monitoring Slade's situation at Cardiff.
Slade is out of contract at the Cardiff City Stadium this summer after taking charge of the Bluebirds in October 2014.
The 55-year-old has helped stablise the club after the turmoil of Premier League relegation and the disastrous reign of Ole Gunnar Solskjaer.
Slade has been forced to move on a number of players and work with a restricted budget at Cardiff in the wake of their relegation from the top flight.
Slade has also had his hands tied in the recent January transfer window with the club being hit with a transfer embargo due to breaching Financial Fair Play regulations.
Despite all the upheaval at the club, Slade has guided Cardiff to ninth place in the Championship, just four points off the play-off places.
Cardiff have three of their last five Championship games as they look to make a push for promotion in the final few months of the season.
Cardiff owner Vincent Tan is thought to be happy with the job Slade has done in steadying the ship at the club in difficult circumstances, but rival clubs have been put on alert by the news that Cardiff have yet to open talks with the experienced manager over a new deal yet.
Slade has a wealth of managerial experience after being in management for over 20 years and he is sure to have no shortage of suitors should Cardiff not tie him down to a new deal.