The Spain striker played 87 minutes of Liverpool's 1-1 Champions League draw with Lyon on Wednesday, a result which virtually ends their hopes of progress from Group E into the last 16.
Torres played with pain throughout the match, before flying back with the Liverpool party on Thursday morning.
Later on Thursday he attended a Liverpool hospital where more tests were carried out on his injury.
Manager Rafael Benitez fears that Torres will eventually need an operation on what he describes as a "poor man's hernia."
However, Liverpool are loathe to go down that route until every other avenue has been explored.