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Liverpool captain Jordan Henderson will be sidelined for between six to eight weeks with the knee injury he sustained against Dortmund.
The Reds' captain was substituted at half-time of Thursday's Europa League quarter-final first leg 1-1 draw with the German side at the Westfalenstadion.
Liverpool manager Jurgen Klopp admitted afterwards that the injury "doesn't look good', and a scan on Friday confirmed that the England midfielder had suffered a lateral collateral ligament injury that will keep him out for up to two months.
Henderson is therefore struggling to be fit for England's European Championship finals campaign in France this June, with Three Lions manager Roy Hodgson set to announce his Euro 2016 squad on 12 May.
The 25-year-old does not require surgery on the injury, and Liverpool say the injury is not as bad as initially feared.
"Under normal circumstances, an LCL injury can typically lead to anything up to a three-month lay-off," a club statement read.
"However, Henderson’s issue appears to be less serious and providing all goes well with the midfielder’s recovery programme, the time out of action could be limited to between six and eight weeks."
Henderson, who was sidelined for three months earlier this season following a heel in jury he sustained against Bournemouth in August, left the ground on crutches on Thursday.