Birmingham City boss Lee Clark has gone public with his complaints over the behavour of agents last month.
Clark has added his voice to that of West Ham owner David Sullivan in asking for the issue of players' agents to be looked at.
Birmingham City's boss gave his backing to the claims made by the Hammers' owner that he had felt threatened after a number of deals last week fell through.
He said: "I read what David Sullivan had to say about agents and I agreed with him.
"We have had deals in place this week and there have been seven or eight people trying to jump in on them."