The Premier League giants will be without no.1 Guglielmo Vicario for at least one or two more months.
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He is absent due to a fractured foot, which required surgery earlier this season.
Per The Mirror, Johnstone may be the one that Spurs target as his temporary replacement.
Johnstone, a £10 million summer signing for Wolves, could be sold for a similar or higher fee.
The Molineux Stadium club are willing to part with him, as he is still second choice behind Jose Sa.