A 35-year-old man has been arrested after another man was found with a head injury in Bampton.
The man from Minster Lovell was arrested in connection with the injury in Pembroke Place on the 28th May.
The man was assaulted in Market Squaren in Bampton between 4am and 8am.
The 33-year-old victim was helped by a member of the public before paramedics arrived and took him to Radcliffe Hospital in Oxford.
He required surgery and has since been transferred to Witney Community Hospital while awaiting further surgery.
Thames Valley Police is appealing for anyone with information about the incident to call 101.
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Sergei Skripal, the ex-Russian spy who was the target of the attack, and his daughter Yulia, remain in a critical but stable condition.