West Ham are in talks with Benfica over the signing of midfielder Gedson Fernandes, Sky Sports News understands.
Discussions are underway over a possible 18-month loan deal which would include an option to buy, with David Moyes looking to make his first signing since returning to the club last weekend.
Fernandes, who has also been linked with Manchester United, favours a move to the Premier League and his preferred destination is the London Stadium because of family reasons.
Speaking in his press conference on Friday, Moyes said: "I don't think I would go so far as to say we are in deep talks. He is a name mentioned alongside many. I wouldn't go as far as that.
"He comes into the category. We want to add a player in that department. If we can add one to the group that will help us."
Speculation over West Ham and their potential interest in the 20-year-old peaked on Thursday evening when he added West Ham's 'Irons' emoji to his name on an Instagram post.
His representatives are understood to have already spoken to multiple Premier League clubs about the twice-capped Portugal international.
Fernandes' release clause is £102m but Benfica have conceded they will not get close to that figure for a player who is out of favour and is reported to have fallen out with head coach Bruno Lage.
Moyes confirmed that he wants to bring in a new goalkeeper but says former Hammer Darren Randolph is not his only target for that position.
He added: "We are talking with some other goalkeepers as well. It's not just Darren. We are looking to add another goalkeeper to the squad."
West Ham have also been linked with Bournemouth stopper Asmir Begovic and Brazilian striker Gabigol.
Moyes said when asked about further targets: "I would love to answer your questions with great knowledge but I've only been in the door two days and I've had lots of agents offer players to me."
How to follow the January transfer window
Sky Sports will bring you the very latest news from the January transfer market with the return of three shows.
Start your day with Good Morning Transfers at 9am as our team of reporters bring you the latest news and insight. Transfer Talk then follows at midday delivering analysis of the biggest stories. Then join us at 7pm for the definitive round-up of the day's news with The Transfer Show.
Meanwhile, the Transfer Talk podcast will also be back at the turn of the year with more expert analysis from here and across the continent.
And as well as tuning into Sky Sports News, don't miss a thing with our dedicated Transfer Centre blog.