Oyetunde has joined St Albans on a month-long loan, with the deal rubberstamped on Friday.
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The 18 year-old signed pro terms with Arsenal last year.
This season, Oyetunde has trained several times with manager Mikel Arteta's first team.
Isthmian League Premier Division St Albans were beaten 6-0 by League One Burton Albion in the FA Cup first round on Saturday.
Oyetunde was a second-half substitute for St Albans.