Celtic manager Neil Lennon is "hoping and praying" for the recovery of former Hoops team-mate Jackie McNamara.
The 46-year-old was taken to Hull Royal Infirmary on Sunday night after collapsing outside his home in York and is said to be in a critical but stable condition.
Lennon, who played alongside McNamara during the early 2000s, said: "I am lost for words, I don't know what to say.
"I spoke to him on Tuesday so I am devastated by the news and hoping he pulls through.
"People have been keeping me abreast of things. He is a strong guy, a great guy and a fit boy for someone of his age.
"He has been fit all his life so I am hoping and praying he comes through OK."
On Monday, McNamara's family wrote on Twitter that he was receiving the "best care possible".
A post on his 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."
This is Jackie's daughter.— Jackie McNamara (@Jackie_Mc4) February 10, 2020
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. ??