Shrewsbury boss Gary Peters says goalkeeper Joe Hart will not leave Gay Meadow until he is worth £1m.
Hart, 18, is reported to have attracted attention from Premiership clubs after breaking into the Shrews first-team.
But Peters told his club's website: "We know what we've got and don't need him to go anywhere [on trial]. He needs to get 100 league games under his belt.
"If he goes anywhere then he needs to go there as a first-team keeper and someone can pay over £1m for him."