Sergio Aguero will finally make his full debut for Barcelona on Wednesday evening when they make the trip to Rayo Vallecano in LaLiga.
Aguero joined Barca in the summer upon the expiry of his Manchester City contract but has missed most of the season so far after picking up a calf injury shortly after his arrival.
However having come off the bench in recent games against Valencia, Dynamo Kiev and the defeat by Real Madrid, Koeman now trusts the Argentina international to lead the Barca attack from the start.