The Scotland international has been one of the Bluebirds' most reliable performers in a difficult first season in the Premier League for the Welsh outfit.
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Marshall's performances this season - which have seen him record more saves than any other keeper in the top flight - have alerted the interest of other clubs, but the former Celtic hot-stopper is only interested in Cardiff's battle against the drop.
"I am desperate right now to try to help keep this club in the Premier League," he told Wales Online.
"At this moment in time my personal career does not really come into it. I am going to be judged over these last games now.
"That's me, all the other players and the club as a whole. I will be concentrating now on keeping Cardiff up. We've got a huge game coming up against Crystal Palace (on Saturday).
"The focus is on that and getting the three points. That is the main aim right now."