Tottenham midfielder Dele Alli is already undergoing preseason training.
The Examiner reports Alli and Sheffield United fullback George Baldock have cut their holidays short to take personal fitness sessions.
Baldock took to Instagram yesterday to post a picture alongside Alli and his former Spurs team-mate Kyle Walker-Peters at a professional training camp abroad.
Baldock said: "Good week away getting ready for pre-season."
Alli also shared footage of himself at The Campus sports village in Portugal, saying: "The graft doesn't stop."
The pair know each other well from their time together at MK Dons earlier in their careers.