Kieran Tierney is facing a tough battle with England under-18 international Bukayo Saka to be first choice left-back at Arsenal , according to Gunners boss Mikel Arteta.
Saka was drafted into the position from his more natural left-wing role after injuries to Tierney and Sead Kolasinac left the Gunners struggling.
The young star's performances since have left him being talked about for an England cap after he grabbed a goal and four assists in ten games from his adopted postion.
And ahead of this weekend's tie with relegation-haunted West Ham , Arteta stressed that £25m signing Tierney will not just walk into the his first XI.
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