Mikel Arteta praised his Arsenal side at the end of an “immensely difficult” week after they drew 1-1 with 10-man Chelsea at Stamford Bridge.The Gunners started a Premier League match with neither William Saliba nor Gabriel in defence for the first time this season, Martin Odegaard and Viktor Gyokeres only fit enough for the bench and Leandro Trossard injured, they had to come from a goal down to take a point that put them five clear at the top of the table.