Arsenal missed the chance to heighten the congestion at the top of the Premier League and suffered fresh injury blows when a frustrating 1-1 draw at Norwich City failed to take them alongside leaders Manchester City and Leicester City on Sunday.
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Chelsea were declared the "autumn champions" by coach Jose Mourinho as they maintained their unbeaten start to the season with a 2-1 win at Anfield on Saturday that kept them four points clear of Southampton at the top of the Premier League.
Liverpool substitute Adam Lallana struck deep into stoppage time to snatch a 5-4 win over shell-shocked Norwich City in an extraordinary Premier League game at Carrow Road on Saturday.
'We want to thank him (Costa) for what he did with this club. We wish him all the best for the future'
Arsenal beat Fulham 2-0 at the Emirates and Manchester City beat Cardiff City 4-2 at the Etihad before Liverpool could only manage a 2-2 draw at Anfield having trailed 2-0.