Arsenal captain Laurent Koscielny has suffered an injury setback in action for the U23s last night.

He limped off after 80 minutes of Arsenal U21s' 2-1 win over Portsmouth in the Checkatrade Trophy.

The experienced Frenchman suffered a serious Achilles injury against Atletico Madrid in May and has been gradually working his way back to fitness.

It is unknown whether Koscielny aggravated his previous injury or suffered a fresh problem, but the 33-year-old will be hopeful of being back in Unai Emery's plans sooner rather than later.

He made his comeback last month, playing 45 minutes as Arsenal U23s defeated Derby U23s 5-0.