Albion expect to be without Jeremy Sarmiento for up to two months.
Head coach Roberto De Zerbi said he is disappointed to lose the Ecuador international for a busy period.
Sarmiento fractured a metatarsal while on international duty.
De Zerbi said he would be out for a month-and-a-half to two months.
He added: We are sorry for Jeremy because now we endure a very tough period, a tough month with seven games.
“We will play every three days and it would be better to have a complete squad, but we will be ready.
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