Koscielny says Arsenal must unite and show fight to stake title claim

Laurent Koscielny praised the strength in depth in the Arsenal ranks after Olivier Giroud marked his first Premier League start of the season with a Boxing Day late winner against West Brom.

Having played second fiddle to Alexis Sanchez for much of the campaign, injuries to Theo Walcott and Alex Oxlade-Chamberlain gave Giroud a chance in Arsene Wenger's starting line-up.