At just 19 years, 11 months and, at time of writing, 8 days, the greatest asset El Shaarawy possesses is his age. Or lack thereof.
Any mistakes he makes at this stage of his career can but put down to youthful exuberance or insufficient experience, whereas every goal or piece of skill is just evidence of his huge potential.
As an asset to the club, this is also the case. At a time where balancing the books is of prime importance in European football, having young players like El Shaarawy and Alexandre Pato is actually financially preferable to owning, say, Zlatan Ibrahimovic and Andrea Pirlo.
As a caveat to this, it should be noted that the aforementioned Pato showed similar promise at 19 and is yet to flourish as a senior player. Milan will be hoping the young Italian's upward curve continues, as opposed to the Brazilian's which has flattened out.
But, if he can avoid the injuries that have beset Pato, there is no reason to assume that El Shaarawy cannot become a fixture in the Milan side.