Watford are one of a number of clubs being linked with a potential move for Porto midfielder Hector Herrera.

The 28-year-old Mexican international is out of contract at the Portugese side at the end of the season and is reportedly looking to move on.

The Hornets, Arsenal, Tottenham Hotspur and Crystal are said to be monitoring Herrera’s situation, with Inter Milan and Roma also interested.

Capped 70 times by his country, Herrera has been with Porto since the start of the 2013/14 season.