The former Switzerland Under-19 full-back signed a two-year contract extension with the Magpies in May.
The 21-year-old joined the club from Servette in 2013 and has made five senior appearances for the club, the first in a League Cup tie against Sheffield Wednesday last season.
Young Boys finished second in the top flight of Swiss football last season.
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Newcastle United defender Kevin Mbabu has joined Swiss Super League side BSC Young Boys on a season-long loan deal.