XL were the clubs official sponsors and had been only one year into a three year deal worth around £2.5 million per year.
A statement on the official site reads, "In light of the circumstances surrounding the company, West Ham United have taken the decision to immediately terminate their relationship with XL Holidays. In view of this, the club have suspended all sales of replica shirts until further notice. This will also involve in due course the removal of XL Holidays branding from all West Ham United platforms.
"West Ham United will be seeking further talks with the administrators at the earliest opportunity to clarify the situation regarding the company.
"The club hopes to have another update early next week and will communicate this via whufc.com as soon as appropriate. As stated, our sincere sympathies are with those XL Holidays customers and staff directly affected by today's news."