Sheffield United players can report Cristiano Ronaldo is maintaining his fitness levels while away from Manchester United.
Ronaldo is yet to return to Carrington this preseason as he attends a 'personal issue' this summer.
The striker is said to have requested United listen to offers for him as he pushes to depart.
The Daily Mail says Sheffield United's players were surprised to see Ronaldo training on his own on the pitch next to them during their training camp at Lisbon's Portuguese FA training centre.
The Blades have been doing part of their preseason in Portugal this month.
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