It has been reported that West Ham are interested in signing Kolasinac from Premier League rivals Arsenal in the summer transfer window.
Arteta has told the Bosnia and Herzegovina international left-back that he can leave, with Kieran Tierney the first-choice player in that position, according to the report.
Tierney is one of the best left-backs in the Premier League, and when fully fit and available, the Scotland international will be the main guy at left-back for Arsenal.
The former Celtic star is brilliant defensively and is also great going on the attack, and if Kolasinac wants to play regular first-team football, then it would make sense for him to leave the Gunners this summer.
Joining West Ham United
West Ham could do with a new left-back this summer, as Arthur Masuaku has not been at his best for a while.
Kolasinac knows the Premier League well and is a very experienced footballer, and he would make West Ham a better team defensively.
However, leaving Champions League-chasing Arsenal for relegation-strugglers West Ham would be a step down for the left-back.