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BBC Sport takes a look at a few big things to watch out for on 31 August, as clubs scramble to complete last-minute signings.
Phil McNulty looks at the players worth keeping an eye on as the seconds tick down to the end of the summer transfer window.
Arsenal sign Valencia defender Shkodran Mustafi for more than £35m and Deportivo La Coruna forward Lucas Perez for £17.1m.
England international Eric Dier believes it is "unfair" that the transfer window - which closes at 23:00 BST on Wednesday - is still open when the Premier League season starts.
How to follow the latest deals on transfer deadline day across BBC TV, radio, social media and online.