Manchester United manager Louis van Gaal warned fans not to expect too much too soon from Anthony Martial.
The French forward marked his debut with a stunning solo goal in the 3-1 win over Liverpool, but the Dutch boss believes fans need to be patient with their new forward.
Martial, a £36 million addition from Monaco, hit the ground running in the Premier League, scoring 21 minutes after coming off the bench, to the delight of his manager.
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However, Van Gaal believes it will take time for the 19-year-old to adapt to life in England and does not expect him to have the consistency of more experienced players in the squad.
As per ESPN, the former Holland manager said: "He is still 19-years-old, he has to adapt to a new culture, to the high rhythm of the Premier League.
"Still, you cannot expect from players from this age that they have consistency. You cannot ask that. You can ask that from [Bastian] Schweinsteiger and [Michael] Carrick but not players of 19 and 20 and 21 and we have many players of that age."
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Martial came off the bench and put the game to bed after Christian Benteke's stunning overhead kick offered Liverpool a route back into the match.
The former Monaco striker has drawn comparisons with Thierry Henry, and his goal was reminiscent of the Arsenal legend.
United fans will be hoping to see more of the same from their new signing, who showed a drive and urgency that has been missing from the Red Devils' play at times this season.
As debuts go, it does not get much better than scoring against Liverpool in front of the Stretford End, and the youngster will be hoping to build on his impressive display as the season goes on.