"Darren's in the squad tomorrow, simply because I think it will give him a boost. It's a chance to progress. At this moment in time everything's going fine for him."
The Reds boss expressed his concern about the distances his players travelled with their respective countries in midweek, with Japan's Kagawa, Ecuador's Antonio Valencia and Mexico's Javier Hernandez all involved in long-haul trips for World Cup qualifiers.
"You always have concerns about players travelling in international breaks – we had Chicharito, Valencia and Kagawa," he said.
"They've all done it before, although with Shinji we don't know exactly how he reacts to travelling back from long distances. Hopefully he'll be okay."