The helicopter carrying Srivaddhanaprabha and his party had taken off from the centre circle at the King Power, shortly after the Foxes' 1-1 draw with the Hammers in the Premier League had ended. The crash occurred at 8.20pm on Saturday.
Manchester United were due to face Leicester City away in the Women's Championship on Sunday afternoon but the match was postponed.
Here is a selection of messages that were tweeted by the club and players as the football family rallied in support of our friends at Leicester:
Everyone at #MUFC is deeply saddened to learn that the Leicester City chairman and four fellow passengers have lost their lives following last night's tragic incident.