Petr Cech is sure Arsenal are making the progress required despite the sickness bug which has hit their pre-season tour.
Per Mertesacker and Olivier Giroud were ruled out of the friendly against Bayern Munich on Wednesday and Sead Kolasinac was forced off before half-time after being sick.
Arsene Wenger thought it was food poisoning but the club's medical team have since insisted it is a stomach bug unconnected to anything the players may have eaten.
'We need to find a way to keep hydrated and you need to rest as well,' said Cech.