Manchester United fear Phil Jones' is more serious than expected.
The Daily Mail says United fear Jones will be out for up to 10 days with an adductor injury.
The former Blackburn Rovers man will miss Cardiff this weekend and is a doubt for Bayer Leverkusen in the Champions League next week.
David Moyes is already without the injured Michael Carrick in central midfield.
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball