Martin Caceres has confirmed that a former Southampton player advised him to sign for the club.
Middlesbrough and Newcastle United are said to be keen on the winger, who has struggled to make an impression at Crystal Palace.
Leicester City are said to be eyeing a move for the Middlesbrough star.
Boro picked up only their second home win of the season on Monday, their South American attacker making the difference.
We preview Middlesbrough's predicted line-up to face Chelsea this weekend.
Former Premier League footballer Jimmy Bullard has hit out on Twitter after Middlesbrough pipped West Ham United to October's goal of the month award.
Middlesbrough midfielder Gaston Ramirez is one of the dirtiest players in the Premier League so far this season.
Boro have endured a testing start to the season so a win would have gone down quite well in the North East. If only their star midfielder had been on form.
The winger was making his first start for Middlesbrough and his performance went down well on social media.
With the exception of captain Grant Leadbitter, Boro are expected to line up with their strongest XI as they welcome Watford to the Riverside Stadium.
Boro boss Aitor Karanka has a selection dilemma to contend with before naming his side to play West Ham on Saturday.
Romelu Lukaku netted for the fourth time this week as unbeaten Everton came from behind to comfortably beat Middlesbrough 3-1.
Hull City could give four summer signings their debuts against West Ham United on Monday evening.