Ajax Amsterdam's Ivory Coast striker Sebastien Haller marked his Champions League debut with four goals in a 5-1 romp at Sporting Lisbon on Wednesday.
Haller, who moved from West Ham for 22.5 million euros in January after netting 14 times in 54 outings for the Londoners, scored in the second, ninth, 53rd and 63rd minutes.
The 27-year-old has been in a rich vein of form recently having also scored twice in nine minutes to give the Ivory Coast a 2-1 World Cup qualifying win over Cameroon last week.
Steven Berghuis added the other goal for the four-time European champions with Paulinho grabbing a consolation for the Portuguese side in the Group C clash.
In the group's other match on Wednesday, Borussia Dortmund came away from Turkey with a 2-1 win over Besiktas in Istanbul.