West Ham head coach Graham Potter's position is under significant internal scrutiny with the club now considering managerial alternatives.
Potter, 50, is under growing pressure to keep his job at the London Stadium following a disappointing start to the season that plunged to new depths following Saturday's home defeat by Crystal Palace.
Multiple sources have told BBC Sport that even prior to Saturday's loss - their fourth from five Premier League games - the Hammers had started the process of identifying potential replacements for Potter.
Nuno Espirito Santo, recently sacked by Nottingham Forest, is understood to be among the options West Ham have pinpointed.