West Bromwich Albion manager Steve Clarke has insisted that his side must be positive against a "fired up" Arsenal side.
The Baggies have lost their last two Premier League matches while Arsenal were booed off after they lost 2-0 to Swansea City last weekend.
Clarke believes that will have only motivated Arsenal to produce an improved performance on Saturday.
"It's a game that we have to be positive about and look forward to," he told reporters.
"The last two games have been frustrating for us for different reasons but going down to the Emirates is a different challenge.
"Arsenal are probably not playing as well as they would like and they've had some reverses so they'll be fired up to try to turn their season around."
West Bromwich Albion are currently five points ahead of Arsenal in the Premier League table.
