Tottenham are reportedly monitoring Porto goalkeeper Diogo Costa for a potential transfer.
The North Londoners are in search of a replacement for Hugo Lloris who would reportedly leave the club soon.
Therefore, the Premier League outfit have been intensively watching the 23-year-old keeper and are delighted with his recent form.
However, according to a Correio de Manha quoted by SportWitness, Spurs might have to spend a huge amount of money to secure the player's transfer as the Portuguese side is unwilling to lower the transfer fee and Costa has a release clause worth €75 million (£66m).
Porto's ace has been a regular player for both club and country this season, making 33 appearances, while conceding 25 goals and keeping 16 clean sheets in all competitions.