Lovren and Oxlade-Chamberlain left out of Liverpool squad
Both remained on Merseyside instead of travelling to Portugal.
Centre-back Lovren was absent from the lunchtime session at Melwood because of illness while Oxlade-Chamberlain, who played for the under-23s at the weekend, was working on his individual fitness as he closes in on a return to action after a year out with a serious knee injury.
Both remained on Merseyside when the 21-man travelling party boarded the flight to Portugal later in the day for the Champions League quarter-final second leg.
Fellow midfielder Adam Lallana, who has missed the last three matches with a muscle injury, was also included in the squad as was Joe Gomez, who is yet to make his comeback after breaking a leg in December.