The 24-year-old midfielder missed the Gers’ Europa League game against Benfica and their League Cup tie against Falkirk.
There were rumours the Nigeria international was not involved in the encounters because he tested positive for the coronavirus.
Gerrard, however, swiftly dismissed the report and revealed the versatile player is suffering from an undisclosed illness.
Aribo is now gradually overcoming the problem and could make a return against the Belgian club at Ibrox Stadium.
“Ryan Jack is a major doubt, he still has a good chance for the weekend,” Gerrard said in a pre-match press conference. “Aribo will hopefully be back with us, assuming he comes through today’s (yesterday) session.”
Aribo has been with the Ibrox Stadium outfit…