If another Big Ten game had been canceled this week, Ohio State would have been able to play this weekend.
According to ESPN's Heather Dinich, Big Ten presidents approved a process earlier this month that will allow conference teams to schedule a new game against each other if both of their games are canceled by their opponent due to COVID-19 issues in the same week, provided that those two teams aren't dealing with COVID-19 outbreaks themselves and that the new game can be scheduled by Wednesday of that week.
Per Dinich, teams would be allowed to schedule a new game against each other even if they have already played earlier in the season or are scheduled to play later in the season.