The duo flew out to Yokohama on Sunday for the remaining three games of Tour 2013 presented by Aon.
David Moyes confirmed earlier this week that the pair, both recovering from injuries sustained last season, had been making good progress back at the Aon Training Complex. They will now continue that work with their team-mates in Asia.
Shinji Kagawa has also joined the squad in his homeland, having been given some extra time off following his exertions for Japan in the recent Confederations Cup. Moyes now has 23 players at his disposal for the games against Yokohama F·Marinos (23 July), Cerezo Osaka (26 July) and Kitchee FC (29 July).