With both Leeds' first-choice keepers Kasper Schmeichel and Shane Higgs injured, Grayson already has Jason Brown on loan from Blackburn and he is expected to start at the Riverside later today against Middlesbrough.
Alnwick moved to Spurs for £900,000 and made his debut for the North London side in the Carling Cup against Burnley last season. His Premiership debut was also against Burnley.