The 20-year-old arrived at Fratton Park temporarily from Manchester City in the summer.
And his immense potential has been there for all to see this season as he’s established himself as the club’s first-choice goalkeeper – making 35 appearances in all competitions to date.
As a result, his market value has already risen by £500,000 under the guidance of Danny Cowley.
But where does that shoot up in price rank across every League One loan deal ever?
Well, thanks to transfermarkt.com’s transfer values, we can find out...
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5. Lee Trundle - £450k increase
Loan club: Leeds (2008-09) Parent club: Bristol City Appearances: 10 Current club: Retired Picture: Jed Leicester/Getty Images Photo: Jed Leicester

6. Benik Afobe - £450k increase
Loan club: Huddersfield (2010-11) Parent club: Arsenal Appearances: 15 Current club: Millwall (on loan from Stoke) Picture: Alex Pantling/Getty Images Photo: Alex Pantling

7. Patrick Bamford - £450k increase
Loan club: MK Dons (2013-14) Parent club: Arsenal Appearances: 29 Current club: Leeds Picture: Michael Regan/Getty Images Photo: Michael Regan

8. Lewis Gobern - £518k increase
Loan club: Colchester(2008-09) Parent club: Wolves Appearances: 12 Current club: Retired Picture: Shaun Botterill/Getty Images Photo: Shaun Botterill

