The transfer window is open and here are all the developments from Daily Mail Sport's Simon Jones - including the latest on Crystal Palace's move for Evann Guessand and Fulham's Ricardo Pepi impasse.

Eagles swoop for Guessand

Crystal Palace are close to signing Evann Guessand on loan from Aston Villa with an obligation to buy in the summer for £28million if a set number of appearances are made.

Guessand travelled last night and will undergo a medical today. Palace had earlier agreed a deal for Wolves striker Jorgen Strand Larsen, but Guessand's arrival has put the brakes on that. Intermediaries, including agent Jorge Mendes, had verbally agreed in principle a £45m offer plus a further £5m for Larsen, but Palace stopped short of making it official.

They have wanted a forward to cover Jean-Philippe Mateta's potential departure after rejecting offers from Nottingham Forest and anticipate further bids.

Forest, meanwhile, have had a £20m bid rejected for Brighton midfielder Yasin Ayari.

Zinchenko heads for Amsterdam

Arsenal left-back Oleksandr Zinchenko is due in Amsterdam on Friday to undergo a medical ahead of signing for Ajax.

The Ukrainian cut short his loan at Forest and was due to join Ajax on loan but that is being made permanent for £1.2m plus add ons if they qualify for the Champions League to fit in with the Netherlands regulations on work permits for non-EU players.

Disasi nears London switch-up

Chelsea defender Axel Disasi is close to joining West Ham on loan.

The Hammers have also made an enquiry for Atalanta's Poland international midfielder Nicola Zalewski.

Chelsea are to hold further talks with Rennes in their efforts to sign centre back Jeremy Jacquet for this window. The French club want to keep the £56million-rated 20-year-old until the summer.

Pepi deal reaches impasse

Fulham's pursuit of PSV Eindhoven striker Ricardo Pepi has stalled with the clubs around £800,000 apart. PSV want to sign a replacement with time running out and Pepi is content to stay until the summer if nothing can be agreed. Fulham are also evaluating Genk’s 6ft 2ins striker Oh Hyeon-gyu. The South Korean international has scored ten goals in 30 appearances this season.

Wolves eye Basel duo

Wolves have spoken to FC Basel about winger Philip Otele and versatile defender Jonas Adjetey.

Talks over the transfer of Emmanuel Agbadou to Besiktas are at an impasse after they failed to agree on a fee but the Turkish side may resurrect talks with their window open until February 11.

Imray to join The Baggies on loan

Crystal Palace right-back Daniel Imray is joining West Brom on loan.

Sunderland defender Aji Alese has joined Portsmouth on loan. Wrexham have made an approach for Ipswich forward Sammie Szmodics while defender Conor Coady, 32, has joined Charlton. Bradford City are closing on agreement with Wrexham over a loan deal for striker Paul Mullin.

Leicester City have confirmed midfielder Boubakary Soumare has joined Qatar side Al Duhail.

Watford are close to agreeing a loan for Manchester City left-back Stephen Mfuni, 17.

Banel heads to Derby

Derby have signed Burnley winger Jaydon Banel on loan.