West Ham insist Eggert Magnusson is not being frozen out after he stepped down as executive chairman this week.
Magnusson remains at Upton Park in a non-executive capacity.
"The fans will still see Eggert in the directors' box and he will remain as non-executive chairman," said club spokesman Mike Lee, who could become a board member under the new plans.
"It was felt, though, that the club needed a new corporate structure to take it on to the next level."
Manager Alan Curbishley and his staff are not affected by the changes.
"I am so proud of what we have achieved," said club owner Bjorgolfur Gudmundsson. "We can be confident about the future."