Arsenal manager Mikel Arteta says there are "no number ones" in his squad after signing goalkeeper David Raya.
The 27-year-old has signed from Brentford on a season-long loan which could be made permanent.
Arteta is hoping to increase competition in his goal with Raya challenging England keeper Aaron Ramsdale.
"To be better [as a team], the environment has to be better," Arteta said.
Ramsdale, 25, kept 14 clean sheets last season as Arsenal finished runners-up to Manchester City, but Arteta said he hoped Raya's arrival and greater competition for places in his squad will lift his players to improve their level of performance.