Lazio coach Maurizio Sarri isn't ruling out Ciro Immobile making the derby against Roma this weekend.
Immobile is hoping to shake-off injury to make the clash.
Sarri said after defeat at Europa League opponents Feyenoord: "I have absolutely no idea, it is in the hands of the doctors.
"Tomorrow (Friday) I will go to Formello and we will have some more ideas.
"We will train when we return tomorrow, on Saturday we will be together all day. Both in the morning and in the afternoon, two mini-workouts to prepare for the derby."