This article is more than
8 year oldThe 22-year-old scored 27 league goals in the Dutch top flight last season and netted a penalty on his international debut against England in March.
He is Spurs' second summer signing, after the £11m arrival of Southampton midfielder Victor Wanyama.
French champions Paris St-Germain and German club Wolfsburg were also reported to be interested in Janssen.
His performances in his debut top-flight season earned him the Johan Cruyff Trophy, awarded to the Eredivisie's young player of the year.
Janssen has played five times for his country, scoring three goals.
Subscribe to the BBC Sport newsletter to get our pick of news, features and video sent to your inbox.
Newer articles