The boss is keen to give all of his squad playing time during the tour to prepare them for the upcoming season.
David De Gea, Victor Lindelof, Eric Bailly and Romelu Lukaku look set to feature after missing the 2-0 win over Perth Glory at the weekend but Lee Grant and Luke Shaw may not be risked.
Ole has also revealed Dean Henderson, Matteo Darmian and Fred are due to join the party in Singapore, where the Reds are taking on Inter Milan in the International Champions Cup.
One of the main things under consideration from the boss is whether he changes the entire line-up at half-time, as was the case in the Tour 2019 opener on Saturday.