It’s that time of the year again – the transfer window is now open until September 1 and it’s sure to be a busy period with clubs looking to make big signings ahead of next season. Here are today’s latest developments from Simon Jones and the Daily Mail Sport team…Fresh twist in Casemiro’s Inter Miami move Casemiro’s move to Inter Miami still hinges on final negotiations over his discovery rights.The former Manchester United midfielder has agreed a two year contract with option for a third year with co-owner David Beckham’s franchise but Miami have still to agree a package with LA Galaxy.As Daily Mail Sport reported, Galaxy demanded £750,000 ($1million) in compensation for their discovery rights after being the franchise that first instigated contact with the Brazil international.They also proposed to the 34-year-old a number of contract offers before his head was turned by the prospect of living in Miami and linking up with Argentina captain Lionel Messi.Talks are now around the £450,000 mark as Miami try and seek a compromise on the figure.Galaxy, however, have also asked for Miami to be fined £750,000 for breaching discovery rights regulations. Casemiro’s move to Inter Miami still hinges on final negotiations over his discovery rightsNottingham Forest chase Tottenham star Nottingham Forest are among the clubs showing interest in Tottenham midfielder Lucas Bergvall after he indicated he wishes to leave the club.The 20-year-old believes he will get fewer first team opportunities under Roberto de Zerbi who is pushing for the club to bring in two new midfielders.Aston Villa and Chelsea made enquiries for Bergvall in January but the latter are looking at other options. Bayern Munich have also been monitoring developments.Spurs signed Bergvall ahead of Barcelona but De Zerbi wants experience to guide Spurs more quickly to the next level after two seasons of relegation form.A £75m bid for Sandro Tonali was rejected last week by Newcastle, and as yet no new bid received. They have also opened talks for Manchester United target Mateus Fernandes at West Ham and could yet bring back Joao Palhinha.Bergvall only played 112 minutes of football under De Zerbi, starting one of the Italian’s six games in charge and featuring mainly as a substitute. Nottingham Forest are among the clubs showing interest in Tottenham midfielder Lucas Bergvall after he indicated he wishes to leave the clubBrighton launch fresh bid for Vuskovic Spurs’ young defender Luka Vuškovi?, 19, also believes he can play more regularly elsewhere and has been the subject of three bids from Brighton, the latest £42m plus £3m in add-ons.Brighton are also closing on Austria defender Michael Svoboda from Venezia in a £4.8m deal. Brighton have launched a fresh bid for Tottenham and Croatia star Luke Vuskovic worth £45mForest eye-up Anderson replacement Forest are exploring the market for midfielders as they are in the throes of selling Elliot Anderson to Manchester City for a British record fee.They have also discussed Inter Milan’s Davide Frattesi and Arne Engels at Celtic after making bids in January.Former Liverpool star closes in on Derby move RB Salzburg midfielder Bobby Clark is expected to undergo a medical today ahead of his £6million move to Derby County.The deal will add just over £1m to Liverpool’s coffers as they have a 17.5per cent sell on clause.Clark, who also had interest from Celtic, made an impact on loan at Derby last season.He scored three goals and his form was such that he was nominated for the EFL Young Player of the Season award. RB Salzburg star Bobby Clark is closing in on a £6m move to Derby after a successful loan Middlesbrough and Southampton eye up Mulligan Middlesbrough and Southampton are keen on Hibernian midfielder Josh Mulligan.Boro are exploring options as they continue discussions with Everton for Hayden Hackney.Southampton similarly want a midfielder as Leeds United pursue their Northern Ireland international Shea Charles.Mulligan, 23, had a stand-out season at Hibs prior to an ankle injury but is fit again. He is also on West Ham’s radar as they anticipate a number of midfield exits.