Mackison said: “Almost a third of our entire fleet is unavailable for service, creating a set of circumstances where significant disruption on multiple routes served by major and small vessels is unavoidable.
“Though the situation appeared to be stabilising, emergent issues across major and small vessels means the unprecedented scenario we find ourselves in has worsened.
“Everyone at CalMac is acutely aware of the level of disruption many islands on our network have faced recently, and I apologise for that.”
He added: “The full service impact of the current issues is being reviewed, and plans will be shared with island communities tomorrow.”