Jamie Carragher hit out at Lord Sugar on Monday morning, calling him a 'f***ing idiot' on Twitter after using his tribute to Gerard Houllier to have a dig at Piers Morgan.
Houllier, the former Liverpool and Aston Villa manager, died at the age of 73 just three weeks after having aortic aneurysm surgery in Paris.
The Frenchman, who also managed Paris Saint-Germain and Lyon, had a long history of medical issues, most notably a heart problem and high blood pressure, but the cause of his death remains unknown.
Tributes poured in on social media but Carragher, the former Liverpool defender and Sky Sports pundit who played under Houllier at Anfield, took offence to Lord Sugar's post.