The Tigers midfielder was involved in a clash of heads with Chelsea defender Gary Cahill during a Premier League fixture at Stamford Bridge
Hull City have confirmed that Ryan Mason has undergone surgery after suffering a fractured skull in the 2-0 defeat to Chelsea at Stamford Bridge.
The midfielder clashed heads with Gary Cahill and was treated for almost 10 minutes on the pitch before being stretchered off.
He was rushed to hospital from Stamford Bridge and will remain under medial supervision for a few days at least.
"The club can confirm that Ryan Mason sustained a skull fracture in our fixture at Chelsea this afternoon," read an official statement.