Manuel Pasqual is set for a spell on the sidelines after the Fiorentina man limped out of the 2-1 loss at Inter on Thursday.
The left-back suffered a left thigh muscle strain during the first half of the San Siro encounter. He was replaced in minute 36 by Alonso.
The club captain will have a variety of tests on Friday to ascertain the seriousness of the problem.
Pasqual was a contender to be named in the next Italian international squad given his inclusion in the last Giro Azzurro.