Liverpool right-back Nathaniel Clyne is set to miss around six months after suffering an anterior cruciate ligament (ACL) injury in pre-season.
The 28-year-old suffered the injury in the closing moments of Friday's 3-2 defeat to Borussia Dortmund at Notre Dame Stadium in South Bend, Indiana.
Clyne flew to Boston for Liverpool's next match against Sevilla but after initial swelling went down, tests confirmed the injury and he flew back to Liverpool from Boston.
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Liverpool team doctors are optimistic about the injury, however, as there is no additional damage, and as such Clyne is expected to be in line to return after six months rather than the nine which some who suffer the same injury can be sidelined for.