West Ham have had a bid in the region of £13m for midfielder Hans Vanaken rejected by Club Brugge.
The 28-year-old, who has five caps for Belgium, impressed in the Belgium Pro League for Brugge scoring 15 times in 35 appearances last season.
However, the Belgian champions are demanding a larger fee for their club captain, whose deal at the club runs until 2024 having signed a new five-year deal last season.
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Meanwhile, West Ham manager David Moyes is closing in on the £5m signing of Slavia Prague right-back Vladimir Coufal on a three-year deal.
The Czech Republic international played the full 90 minutes in Slavia's Champions League play-off against FC Midtjylland on Wednesday night and only learned a deal had been reached after full-time.
Coufal boarded a flight from Denmark to London on Thursday morning and will undergo a medical with the Hammers on Thursday before completing the deal at their Rush Green training ground in the afternoon.
He is expected to compete with Ben Johnson and Ryan Fredericks - once the latter returns from a hamstring injury - for the starting right-back berth.
West Ham have watched Coufal several times and have been trying to get a deal done for the last few months, with negotiations proving tricky.
Transfer Deadline Day - October 5
The summer transfer window closes at 11pm on Monday October 5 with a feast of activity throughout the day involving the biggest names in football.
Some of the highlights to enjoy on Sky Sports News and across our Sky Sports platforms:
- Breakfast with David Ginola and Rachel Yankey
- The Football Show Special with Dwight Yorke and Andy Cole
- Countdown with Harry and Jamie Redknapp
- Supporters at the heart of the show with Sky VIP fan wall
You can also follow the stories on Sky Sports' digital platforms, with our dedicated Transfer Centre blog.
Here's all you need to know about Deadline Day and how to keep across all the deals and drama with Sky Sports.