He also dismissed concerns he has an uneasy relationship with manager Sam Allardyce.
Mort Blames West Ham For Dyer Situation
Mort told BBC Radio Five Live: "We got very uncomfortable with the way they (West Ham) were conducting negotiations and some of the things going on about the deal we wanted to change from our perspective.
"They were (then) not prepared to match the valuation we put on him.
"Sam and I speak most days, if not every day. This afternoon we sat down together for an hour or two and went through the squad and players we are looking to add.
"They were (then) not prepared to match the valuation we put on him.
"Sam and I speak most days, if not every day. This afternoon we sat down together for an hour or two and went through the squad and players we are looking to add.
"That work is continuing and we will carry on going forward.
"Our relationship is absolutely fine, we get on very well together."