West Ham's record signing Marko Arnautovic scored his first goal for the club in a 2-2 draw with Werder Bremen.
Austria forward Arnautovic, who signed from Stoke in a £20million deal which could rise by a further £5m, turned in Arthur Masuaku's deflected cross for a 25th-minute equaliser.
Luca Caldirola had given Werder Bremen a 15th-minute lead, with England goalkeeper Joe Hart unable to stop the close-range header on his Hammers debut.
Young Spanish striker Toni Martinez put West Ham ahead after 75 minutes when he headed home Andre Ayew's cross.
But Zhang Yuning, the China striker on loan from West Brom, struck nine minutes from time to hand Bremen the Betway Cup 3-2 on aggregate, as the Bundesliga side had won Friday's first leg in Schneverdingen 1-0.
West Ham fans would have been heartened to see Hart make his first appearance since his loan move from Manchester City, although he did not reproduce the heroics of Adrian on Friday.
Slaven Bilic was able to give a good run out to most of his squad over the two games and, despite the aggregate defeat, he will be hoping that it will serve as good preparation ahead of the upcoming Premier League season.
