The family of Jackie McNamara have said the Celtic legend is receiving the "best care possible" after he fell seriously ill and was rushed to hospital over the weekend.
The 46-year-old is understood to have been admitted to hospital for brain surgery.
John Hartson, his former Celtic team-mate, stated that McNamara had collapsed on Saturday with a "bleed on the brain".
Reports say he is being treated in Hull, having first been taken to hospital in York after collapsing near his home in the city on Saturday.
A post on McNamara's personal Twitter account read: "This is Jackie's daughter. Thank you all for your kind words and support. My dad is getting the best care possible, as you all can understand this is difficult for us as a family and request privacy at this time."
After the news emerged on Monday, former clubs and team-mates of McNamara have sent their best wishes to the former Scotland international.
Hartson wrote on Twitter: "Worried sick for my former teammate and great friend Jackie McNamara who collapsed at home Saturday with a bleed on the brain.. my thoughts are with his wife Samantha and the children."
Scottish champions Celtic wrote on Twitter: "The thoughts and prayers of everyone at Celtic are with Jackie and his family."
Former Celtic striker Chris Sutton added: "Thoughts and prayers for Jackie and Sam and the family."
A statement on the Scotland National Team Twitter account read: "The thoughts of everyone at the Scottish FA are with former Scotland player Jackie McNamara and his family."
Other former clubs including Aberdeen, Wolves and Dundee United also sent their best wishes.
The former Dundee United, Partick Thistle and York manager has been working as a players' agent as well as advising Dunfermline through his sports management firm.
McNamara recently opened a sports bar in Fuengirola, Spain, with Simon Donnelly, his former Celtic team-mate and managerial assistant and close friend.
His father, Jackie McNamara Snr, played for Hibernian and Celtic.
