Norwich's big-money summer signing Gary Hooper is a cause for concern after he injured his leg in their friendly win over Panathinaikos.
Hooper joined from Celtic for £5million last month but there are now doubts as to whether or not he will start the season.
He left Carrow Road on a stretcher with manager Chris Hughton hoping there was nothing to worry about.
"Gary has been taken for a precautionary X-ray. He got a whack on the shin, it was an awkward challenge," he told his club's Twitter feed,
"We'll wait and see what the X-ray shows but hopefully it's just a whack which will be a bit sore rather than anything more serious."
Bradley Johnson scored both of Norwich's goals as the Canaries claimed a 2-0 victory.
In Finland, Arsenal struck a possibly big psychological blow to Manchester City as they beat them 3-1.
The Gunners belied the amounts spent by the respective sides over the summer as they blew City away, with Theo Walcott, Aaron Ramsey and Olivier Giroud putting them clear.
Alvaro Negredo replied for City.
Nicolas Anelka continued his fine pre-season form as he scored again for West Brom - joined on the scoresheet by Markus Rosenberg - in a 2-0 win over Bologna.