Arsenal have signed Spanish keeper Manuel Almunia from Celta Vigo for an undisclosed fee.
Almunia could put more pressure on Jens Lehmann
The 27-year-old will be competition for first-choice keeper Jens Lehmann.
Arsenal manager Arsene Wenger told the club's website: "We are pleased to have signed Manuel Almunia, who will provide good support to our squad.
"We have watched him for a while, and he proved last season during his time on loan at Albacete that he can perform effectively at the highest level."
Arsenal described the contract as "long-term", adding that Almunia would join the rest of the squad immediately for pre-season training.
The Gunners had reduced the number of keepers at the club after releasing Rami Shaaban and loaning out Graham Stack to Millwall.