Vincent Janssen
Janssen was reportedly the subject of a £12m bid from Spurs.Getty

Tottenham Hotspur are yet to improve their offer for Dutch striker Vincent Janssen after AZ Alkmaar rejected opening bids from the Premier League side.

Having already added Vincent Wanyama to his squad ahead of the 2016-17 season, Mauricio Pochettino is keen to secure another striker to his options to ease the burden on Harry Kane, the club's only specialist centre-forward.

Janssen, 22, has emerged as a target for the Premier League outfit, with Dutch daily De Telegraaf reporting Tottenham have had three offers – the most recent for a fee of €14m (£11.3m, $15.4m) spread over three years – turned down.

Netherlands international Janssen, who finished as the Eredivisie's top scorer last season, is wanted by both Spurs and Bundesliga club Wolfsburg, while Paris Saint-Germain have also been credited with an interest.

But AZ's director of football, Max Huiberts, insists there have been no more offers for the club's prized asset. "I read everything and see another amount doing the rounds. It would now appear I have given a fee [for Janssen] but that is nonsense. In fact, I am against the club naming any amount we want for Vincent," he told Voetbal International.

"We have rejected bids [from Tottenham and Wolfsburg]. There is therefore no change in situation around Janssen. I read that Paris Saint-Germain are now interested, but we know nothing about that. PSG have not reported to us."

Tottenham are yet to improve their offer for Janssen, but have also enquired into the availability of AS Roma starlet Tony Sanabria, whose agent recently confirmed contact from the Premier League club.

Sanabria is a graduate of Barcelona's famed La Masia academy and the Catalan giants are reportedly considering bringing him back to the Nou Camp to act as cover for the trio of Lionel Messi, Neymar and Luis Suarez.

However, according to Catalan daily Sport, Barcelona have informed the forward's agent their interest is limited, and have urged the 21-year-old to take any other interesting offers that come his way. Tottenham are yet to agree a fee with Roma for the player, though.