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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13. Nathan Byrne - £720k
Loan club: Brentford (2010-11) Parent club: Spurs Appearances: 4 Current club: Derby Picture: Mark Thompson/Getty Images Photo: Mark Thompson
14. Josh Bowler - £810k increase
Loan club: Hull City (2019-20) Parent club: Everton Appearances: 30 Current club: Everton Picture: David Rogers/Getty Images Photo: David Rogers
15. Luke Matheson - £810k increase
Loan club: Rochdale (2019-20) Parent club: Wolves Appearances: 5 Current club: Scunthorpe (on loan from Wolves) Picture: Laurence Griffiths/Getty Images Photo: Laurence Griffiths
16. James Maddison - £900k increase
Loan club: Coventry (2015-16) Parent club: Norwich Appearances: 11 Current club: Leicester Picture: Michael Regan/Getty Images Photo: Michael Regan