Spurs made an offer of around £11million on Thursday night but the Dutch club are holding out for closer to £17m.

Germany white jersey Tottenham are understood to have agreed personal terms with Janssen and are expected to come back with another bid.

Janssen was given permission to spend two days in London earlier this month and visited the club's training ground, meeting manager Mauricio Pochettino and discussing his plans for the future.

USA black shirt German side Wolfsburg have also expressed an interest to AZ and have spoken to the 22-year-old, but they are yet to rival Tottenham with an official offer.

italy blue jersey Janssen's preferred destination is White Hart Lane, where he is attracted by the prospect of Champions League football next season.

Portugal Red shirt It has also been made clear that while Harry Kane will remain Pochettino's number one striker, he would be given ample opportunity to impress, particularly in cup competitions.

Colombia yellow jersey Kane played in every one of Tottenham's Premier League matches last season and Pochettino wants more cover, as well as greater options off the bench.

Spurs have already bolstered their midfield after they confirmed the signing of Southampton midfielder Victor Wanyama on Thursday.

Janssen is one of Europe's most exciting young forwards, renowned for his energy, work rate and composure in front of goal.

Brazil yelow shirt He scored 27 goals in 34 matches in the Eredivisie last season and also found the net against England in Holland's 2-1 win at Wembley in March