Kolasinac has made a strong start to life at The Emirates following his move to the north London club from German side Schalke in the summer transfer window.
The defender was the star of the show as he helped to fire Arsenal to a 2-1 victory over Swansea City in the Premier League at The Emirates last weekend.
Kolasinac has shown that he has not needed much time to get used to the rigours of the Premier League with the Gunners.
And Arsenal star Sanchez has admitted that he doesn’t like to come up against Kolasinac in training because he is so powerful.
Speaking to Arsenal Player, Sanchez said: “It’s tough [against him in training] because he’s strong and he’s hard to get around!
“He’s a very experienced player and he’s really strong.”
Arsenal return to Europa League action on Thursday night with a home clash against Red Star Belgrade at The Emirates.
The north London side will then switch their attentions back to Premier League affairs and their crunch clash with Manchester City at The Etihad on Sunday afternoon.
Victory for Arsenal, who finished fifth last term, would move them to within five points of the leaders after 11 games of the new Premier League season.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news