Ighalo quit the team after scoring five goals to help Nigeria to a third place finish at the 2019 Africa Cup of Nations in Egypt.
“There’s no reason not to take him if he’s doing well. The question is if he wants to come back,” Rohr said on Goal.
The 31-year-old recently joined Al Shabab after leaving Manchester United when his loan deal ended last month.
He went on to score 16 goals in 36 matches for Nigeria including winning the top scorer award at the 2019 Africa Cup of Nations after scoring five goals.