Sporting's William Carvalho (C) challenges Barcelona duo Denis Suarez and Aleix Vidal during the UEFA Champions League.
The Hammers have released a statement saying the two sides have settled their differences after a very public falling out between the two hierarchies over the summer.
David Moyes, manager of West Ham United, looks on during the Premier League match against Manchester City.
Former manager Slaven Bilic was a keen admirer of Carvalho - with a potential deal for the 25-year-old being the reason behind the controversy between the two teams - and his replacement David Moyes appears to also be interested.
That is probably not good news for captain Mark Noble, who has been greatly criticised for his performances for West Ham over the past two seasons.
Mark Noble of West Ham United takes on Abdoulaye Doucoure of Watford during the Premier League match between Watford at Vicarage Road.
Noble started Moyes' first game as boss after being appointed Bilic's successor in a 2-0 defeat to Watford, but was once again perceived to have a poor performance and has not played for the Scot since.
With Carvalho operating in a similar role to the 30-year-old in central midfield and also being five years the Englishman's junior, if the Portugal international does finally join the East Londoners then that could see the skipper's opportunities reduce even more significantly.