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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9. Gavin Bazunu - £540k increase
Loan club: Pompey (2021-22) Parent club: Manchester City Appearances: 35 Current club: Pompey Picture: Joe Pepler Photo: Joe Pepler
10. David Graham - £675k increase
Loan club: Huddersfield (2005-06) Parent club: Sheffield Wednesday Appearances: 8 Current club: Retired Picture: Ross Kinnaird/Getty Images Photo: Ross Kinnaird
11. Dele Adebola - £675k
Loan club: Bradford (2004-05) Parent club: Coventry Appearances: 16 Current club: Rushall Olympic Picture: Pete Norton/Getty Images Photo: Pete Norton
12. Joey O'Brien - £675k increase
Loan club: Sheffield Wednesday (2004-05) Parent club: Bolton Wanderers Appearances: 15 Current club: Shamrock Rovers Picture: Bryn Lennon/Getty Images Photo: Bryn Lennon