Tottenham have made an £18million move for Bayer Leverkusen forward Heung-Min Son.

The 23-year-old was due to play on Wednesday night in their Champions League qualifier against Lazio but his selection has been thrown into doubt after Tottenham's bid with the player expected in London for a medical. The fee could rise to £21.9m.

Son, who can play on either wing or as a secondary striker, has been on Tottenham's wishlist for some time and has been a target for Liverpool and Everton also.

Heung-Min Son takes on the Hoffenheim defence in a Bundesliga match back in May

The South Korean joined Leverkusen from Hamburg in 2013 and has impressed during his time in Germany, where he has scored 41 goals in 131 Bundesliga games.

Speaking to Sky Deutschland, Bayer Leverkusen sporting director Rudi Voller said: 'There is a request and there are talks. But nothing is done. Son would not have played today anyway, he was sick at the weekend already. At this moment he is our player.

'I saw many medicals in this business where there was no deal afterwards.

'We will try to reach an agreement, but only under our conditions.'

One of the stars at the 2015 Asian Cup in Australia, Son has been nicknamed 'Sonaldo' and is under contract until 2018. His agent, Thies Bliemeister, confirmed Liverpool's interest in March but it is Tottenham who have made the move.

They have also been talking to Stuttgart about Timo Werner but Son would represent a major coup for Daniel Levy.

Napoli are keen on Mousa Dembele but he is not for sale while Erik Lamela could leave if Inter Milan make an improved offer.

Tottenham's £30m flop Erik Lamela could be on his way out if Inter Milan improve their bid

Everton have opened talks with Barnsley over buying out the 15 per cent sell on clause inserted in John Stones's contract.

Everton are anticipating an offer of around £35million from Chelsea for the England defender but want closer to £40m for the 21-year-old.

Everton, Hull City, Southampton and West Brom were all represented at Deepdale on Tuesday as scouts ran the rule over Watford striker Matej Vydra.

The Czech striker has had enquiries from 12 clubs in the Championship and was left out of the weekend squad that drew with Southampton. He did little to impress observers such as Brian Flynn, Stan Ternent and Andy Thorn on Tuesday night but they know he has the quality to play better.

Watford forward Matej Vydra stretches for the ball as they take on Preston on Tuesday night

Everton scouts are also due to attend Wednesday night's Bayer Leverkusen-Lazio Champions League tie.

Watford are continuing talks with French club Rennes over an £8m move for midfielder Abdoulaye Doucoure.

Norwich have made an enquiry for Swansea City defender Jordi Amat.

Manager Alex Neil was keen on Marseille defender Nicolas N'Koulou but the 25-year-old Cameroon international has one year left on contract and is considering seeing out his deal and leaving as a free agent next summer.

Amat missed the end of last season with a broken metatarsal but has returned to fitness and played in Tuesday night's 3-0 Capital One Cup win over York.

Norwich manager Alex Neil (left) is in the market to sign a new central defender this month

Asier Illarramendi has had a medical with Real Sociedad on Wednesday morning after they agreed an £11.7million fee with Real Madrid.

The 25-year old had attracted interest from Southampton and AC Milan on Tuesday but has opted to return to Sociedad in a coup for manager David Moyes. 'I'm happy to come back. La Real was always my first option. I'm excited to come back home,' he told journalists at the airport.

West Ham's hopes of signing Simone Zaza from Juventus may be dashed as the Italians look to sell Fernando Llorente to Sevilla instead.

Juventus wanted to reduce their wage bill and were ready to let Zaza leave on loan, however, Sevilla have made an offer for Llorente which could see him join for £12million.

As a result Zaza wants to see whether he has a role to play in Turin with one less striker blocking his path to the first team.

Juventus are considering selling Italy forward Simone Zaza despite only signing him last month

West Ham are in desperate need of a striker and have also increased their offer to Galatasaray for Burak Yilmaz while talks are ongoing with Nottingham Forest over winger Michail Antonio and with Chelsea over Victor Moses. The latter has also been discussed as a makeweight in Chelsea's bid for John Stones.

Aston Villa striker Libor Kozak has turned down a move to Celtic. The Czech striker has missed the last 19 months at Villa Park through injury, before returning in pre-season and came on as a substitute in last night's Capital One Cup win over Notts County. However, Villa will listen to offers but the Kozak would prefer to move elsewhere to rekindle his hopes of gaining a place in the Czech squad for Euro 2016.

Czech international striker Libor Kozak (centre) has endured two injury-plagued seasons at Villa Park

Southampton are expected to offer £8million for Celtic defender Virgil van Dijk to push through a deal over the next 48 hours.

Bristol City have had a £300,000 bid turned down for Gillingham's Bradley Dack. The 21-year-old midfielder has three years left on contract and is valued closer to £1m. Sheffield United have also shown strong interest. Dack has scored five goals already this season including two in last Saturday's defeat of Wigan.