Sporting head coach Marcel Keizer is not sure whether star midfielder Bruno Fernandes will remain at the club amid strong links to Manchester United.
Fernandes has been tipped to join the Red Devils throughout the transfer window as Ole Gunnar Solskjaer attempts to rebuild his squad after a difficult campaign last time out.
Daniel James and Aaron Wan-Bissaka have already signed on at Old Trafford but it is believed Solskjaer wants at least one more player.
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As a result, talk of a switch to Old Trafford for Fernandes has gathered pace with the Premier League season on the horizon.