Durham have announced that Jon Lewis will act as interim head coach while Geoff Cook recovers from a heart attack.
Durham coach Geoff Cook has shown slight signs of improvement but remains in a
critical condition following his heart attack on Thursday.
Second XI coach Lewis will take charge of the team along with limited-overs skipper Dale Benkenstein, who will offer his support for the forthcoming Friends Life t20 tournament.
"Durham second XI coach Jon Lewis will take over the head coach role in the interim with Dale Benkenstein assisting him during the T20 season which starts next Friday," read a statement from the county.
"Allan Walker will continue to have an influence and will remain in his assistant coach role.
"Alistair Maiden will take over as second XI coach as Jon Lewis steps up to the first team with Neal Killeen assisting Maiden in the seconds coaching structure."
Durham have been inundated with message of support for Cook on social media sites, with skipper Paul Collingwood and former England captain Michael Vaughan among those offering support on Twitter.
Collingwood posted: "All our thoughts with Geoff Cook and his family. Sad, sad day."
Vaughan added: "Thoughts and prayers are with Geoff Cook and his family...A great man.. Get well soon Geoff..."
England spinner Graeme Swann wrote: "Just heard the news about Geoff Cook. Fingers crossed for a speedy recovery for him."
England wicketkeeper Matt Prior added: "Thoughts are with Geoff Cook and his family at this time. Fingers crossed for a full and speedy recovery."