Marshall has been the star performer for Malky Mackay's side this season and will need to be on top form at the Cardiff City Stadium today against Manchester United. Marshall said: "It's difficult as a keeper. You can go from zero to hero in two games - but you can go from hero to zero in two minutes.
"We know what comes with the job. The gaffer has been brilliant with me. He understands you are going to make mistakes in goal.
"But if you have a strong manager behind you and he believes in you then that is a big help.
"You know you are going to be under scrutiny if you make mistakes but you have to keep your confidence up.
"As a promoted club you are going to have more to do than last year. Mistakes will arise but hopefully you can keep them to a bare minimum."
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