However, Thornely, who has filled in so impressively for Azhar Mahmood over the last month, will return to Australia after tomorrow's home game against Hampshire.
Tickets are still available for all four of Surrey's home Twenty20 games (tomorrow: v Hampshire; 28 June v Sussex; 1 July v Kent; 6 July v Middlesex) from www.surreycricket.com
Today's games (5.30 unless stated) - Derby: Derbyshire v Leics; Trent Bridge: Notts v Lancashire; Bristol: Gloucs v Glamorgan; Northampton: Northants v Warks; Chelmsford: Essex v Kent (7.30); The Rose Bowl: Hampshire v Sussex (5.40).