TWO former Saints players had reason to be cheerful as Arsenal defeated Burnley 3-0 at The Emirates.

England defender Calum Chambers netted his first ever senior professional club goal during the victory against the Premier League’s bottom club.

And Theo Walcott made a welcome return off the substitutes bench from a long-term knee injury.

Boss Arsene Wenger was pleased to see Walcott come back after so long out, his last appearance coming in an FA Cup tie against Tottenham during January.

“It is good I could give him 12 or 13 minutes today when the game was nearly won," said Wenger.

“His decision making and movement are good - he just needs to get used to competition.”

Chambers made 22 Premier League appearances for Saints last season without scoring, but managed to open his Arsenal league account at the ninth time of asking.