"Shani is an enormous young talent in Swiss football who, without a doubt, will have a great future," manager Roberto Martinez told the club's website (www.evertonfc.com) on Thursday.
"We're delighted to have found a young player who believes our club is the perfect step for him to enhance his quality and to grow his career."
Tarashaj has scored eight goals in 18 games for Grasshoppers this season.
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(Reporting by Simon Jennings in Bengaluru; Editing by Tony Jimenez)
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