By Chris Harris

Arsène Wenger admits his team suffered a 'power cut' at Emirates Stadium on Saturday.

Arsenal went into the game against West Bromwich Albion on the back of a magnificent win at Tottenham in midweek and with high hopes of cutting Chelsea's lead at the top of the Premier League to one point after the champions lost at Manchester City.

But Wenger's side were a pale shadow of their usual selves and Albion took full advantage, scoring three times in 23 second-half minutes to build what proved to be an unassailable lead, despite a late brace from Samir Nasri.

Wenger was left to ponder the reasons for one of the most listless performances of his 14-year tenure and promised to make changes for Tuesday's Champions League trip to Partizan Belgrade.

"What is the most frustrating is that there was no electricity there," said the manager.

"We had lost a generator and then it becomes difficult to play football. I knew after the first five minutes, you saw that it was all flat. It is unusual for us because we are usually a team that has energy. We were just not there. I can't remember the last time [we were like that]. It was mysterious what happened.

"West Brom played very well but it is the usual defending we get when we play. We made really basic errors defensively if you analyse any of the goals. I just feel that from back to forward we were flat and poor.

"It won't stay on my mind too long," he added. "We never forget it but we play on Tuesday night so of course we have to analyse what happened. I don't know yet [how many changes I will make for the Partizan game] but there will be some changes, that is for sure."

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source 27 Sep 2010