Liverpool are awaiting an update from their own medical staff after reports in Uruguay that striker Luis Suarez requires an operation on a knee problem.
The player was apparently injured during a training session with his national team - who are one of England's opponents at the World Cup - after arriving back in his homeland on Tuesday and it was reported the 27-year-old could undergo surgery in the next few hours to repair damage to the meniscus in one of his knees.
There has been no official confirmation from the Uruguay Football Federation on whether an operation will take place, but it is expected to make a statement later on Thursday.
Press Association Sport understands Liverpool's medical team are currently trying to ascertain the full extent of Suarez's injury for themselves.
Any surgery would likely sideline the striker, the Professional Footballers' Association and Football Writers' Association player of the year after scoring 31 league goals, for at least three to four weeks.
England play Uruguay in Group D on June 19 in Sao Paolo.
Uruguay, however, remain confident at this stage that Suarez will be fit for the tournament in Brazil.
"According to the report I received a while ago, we are optimistic that he can go to the World Cup," secretary of Uruguay's national team, Roberto Pastoriza, told ovaciondigital.com.
"It was all a surprise. Suarez trained with a niggle and decided to have an MRI.
"Until a while ago, the last information I had was that they were deciding what to do. The issue officially will be announced by the AUF on Thursday morning."