LISBON (Reuters) - It was only last month that Sebastien Haller was being jeered off the field but the towering Ajax forward proved his worth on Wednesday with four goals in their 5-1 Champions League win at Sporting Lisbon.

The gangly 27-year-old striker, who Ajax forgot to register for European competition last season, delivered a masterclass in finishing as the Dutch club got the perfect start to their Group C campaign.