William Saliba's injury may not as serious as feared, according to reports. The Frenchman was substituted in the first half against Sporting Lisbon.
While there are concerns that he could be sidelined for a long time, emerging reports reveal that he should return after the international break.
It is believed that Saliba had a lower back problem and not an hamstring injury. Takehiro Tomiyasu also picked up a knock as the Gunners crashed out of the Europa League.
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