Arsenal midfielder Albert Sambi Lokonga has suffered a setback at Sevilla.
The young Belgian is on a season-long loan at Sevilla.
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Marca says Lokonga is facing a break of four weeks due to problems with his hamstring.
The 24-year-old started in the first two games of the season before having a spell on the bench.
He was then completely out of the squad for the last game as a result of a hamstring injury, which has now been confirmed.