West Ham boss David Moyes has adopted a policy of tough love to bring out the best in Marko Arnautovic.
Arnautovic has emerged as the key figure in West Ham's battle to avoid relegation with nine goals in his last 13 league games.
That stands in stark contrast to the forward's struggles during the first half of the season when he was forced to wait until December for his first Hammers goal.
Moyes, who took charge at the London Stadium in November, admits he has been impressed by the player's turnaround - but has now challenged the 28-year-old to reach the next level.