The striker is currently out on loan at FC Metz.
Metz's goal-scorer on the night was Modibo Maiga. He was sent out to Metz on loan in the summer, shortly after West Ham had snapped up Diafra Sakho from the French club.
Maiga was signed from French outfit Sochaux last term for a fee reported by the BBC to be in the region of £4.7 million. The Mali international striker had scored 24 goals in 52 games for the club and West Ham decided to take a punt on the player.
Despite whatever Sam Allardyce originally saw in Maiga, he has struggled to make an impact at Upton Park. The now 27-year-old striker has only featured in 37 games for the Hammers since joining nearly three years ago.
There were underlying reasons for his troubles. He struggled for a long time trying to shake the affects of a malaria infection, picked up in early 2012.
He did however show glimpses of his talent - the goal against Chelsea was a particularly memorable moment from his 2012-13 campaign and has scored six goals for the club overall.
But Maiga,who spent time on loan at QPR last term, has been impressive in recent weeks for Metz. The goal against PSG followed a strike against Lens and a hat-trick v Toulouse this month - taking his tally to five goals in four games and 10 for the season.
Maiga may not appear to have a future at West Ham, although a lot will depend on whether Allardyce stays as coach and if any potential replacement fancies giving Maiga a shot.
Given his recent form, he might just have a future at West Ham yet.