It looks like Caasemiro's decline in quality has Man United ready to sell him. It seems that this is because he has a Hamstring. Sir Jim Ratcliffe, opened an offer to Casemiro, Ratcliffe is the man who will lead the club's sporting department. The money raised will be used to help fund the redevelopment of Old Trafford. But at the current conditions, if Ten Hag does not have a replacement, they will only suffer with the conditions of the game getting worse. Casemiro is a good player, he was able to bring Man United into 3rd place last season.

Source: https://talksport.com/football/1641488/transfer-news-arsenal-newcastle-neves-man-utd-casemiro-tottenham-chelsea/