Raphinha has been a key player for Leeds this season, with his importance underlined by the long-term absences of the likes of Kalvin Phillips and Patrick Bamford.
The Times reported that Villa are the frontrunners to sign Phillips at the end of the season.
If Cooper was playing, would he have marked Dias? The 26-year-old has been linked with a move to Villa Park, while Manchester United have also reportedly expressed an interest in Phillips.
The odds were stacked against the Whites from the off, with Liam Cooper injured in training and Stuart Dallas stretchered off in first-half injury time.