Manager Marco Silva's side now have four keepers fighting for a starting spot, with new recruits Karnezis and Daniel Bachmann, who joined from Stoke City in July, competing with veteran Heurelho Gomes and Romanian Costel Pantilimon.
Karnezis, who has 42 caps for Greece, previously won the Greek league and domestic Cup title with Panathinaikos.
(Reporting by Aditi Prakash in Bengaluru; Editing by Alison Williams)
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