West Ham United have won a series of lawsuits against their London Stadium landlords.
London Legacy Development Corporation (LLDC) have been told they must replace the materials surrounding the pitch, which could cost them £380,000.
LLDC told Sky Sports News on Thursday: "We are complying with all of the decisions made through the expert determination process, including supplying a pitch surround in a contrasting colour, and continue to discuss the solutions with West Ham United.
"We have begun the procurement process for the new pitch surround which will be in place within the next few weeks.
"We are not going to comment on private negotiations, however, we wish to protect our commercial rights which involve securing the best deal for all our assets such as the sponsorship potential of the pitch surround."