West Brom 0 Arsenal 2 Jeremie Aliadiere provided Arsene Wenger with a timely reminder of his talent to ease Arsenal into the English League Cup fourth round.

The 23-year-old has failed to live up to his potential since arriving to Arsenal as a raw teenager and after spending last season out on loan the talk is of a permanent move away from the Emirates Stadium.

Aliadiere stole the show on a night when Theo Walcott sparkled intermittently on his second Arsenal start and Denilson proved why Wenger spent £3.4 million to bring him to England from Sao Paulo.

Fourteen appearances for Wolves as part of his "gap year" had already earmarked Aliadiere as a potential public enemy number one among the West Brom fans even before he went down under Steve Watson's challenge, then got to his feet to put Arsenal in front from the spot in the 34th minute.

There could be no quibble over the quality of his finish, the spot-kick nestling right in the corner, offering Russell Hoult no chance.

West Brom offered little resistance and four minutes into the second half it was 2-0 when Walcott, who was fouled by Paul Robinson, got to his feet and drove a free-kick to Aliadiere, who turned home a first-time shot.

WEST BROM: Hoult, Watson, Curtis Davies, McShane, Robinson, Chaplow (Gera 58), Quashie (Albrechtsen 69), Greening, Carter (Kamara 38), Ellington, Hartson. Subs Not Used: Steele, Wallwork. Booked: Watson, Robinson.

ARSENAL: Almunia, Connolly, Senderos, Djourou, Clichy, Flamini, Song Billong, Denilson (Randall 78), Walcott, Adebayor (Traore 24), Aliadiere. Subs Not Used: Poom, O'Cearuill, Simpson. Booked: Clichy. Goals: Aliadiere 34 pen, 49.

Referee: M Atkinson (W Yorkshire).