Not sure that's a rule, for example in our first season we didn't register Harry Arter and instead of left a spot open which Serge Aurier then took a week or so later.Says here March 26th is the deadline if a spot is unused for the PL. However, I seem to remember there's a rule all available and contracted players must be registered? Dunno though in truth.
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Premier League rule allows Arsenal to make one more signing as deadline clear
Arsenal could sign a player after the transfer window due to Premier League squad registration rules, with a deadline extending to March if squad slots remain unusedwww.mirror.co.uk