Tottenham Hotspur are working to complete seven signings this summer as ENIC go into overdrive in the transfer window. The club knows they got away with one after only avoiding relegation to the Championship on the final day of the Premier League season. Tottenham Hotspur's defence has been a big weakness in recent seasons, with the club conceding 183 Premier League goals across the previous three seasons. The North Londoners have already moved decisively to try and fix their defensive issues, bringing in the experienced Andy Robertson and Marcos Senesi on free transfers. Tottenham are not done there though, with top sources reporting talks for Manchester City's Savinho, Newcastle United's Sandro Tonali, and West Ham United's Mateus Fernandes. According to renowned Tottenham source Paul O'Keefe, Spurs are far from done with their summer business after already completing three agreements. O'Keefe believes that the club will look to bring in four more signings in the remainder of the window, with four key positions identified. Those include central midfield, where Spurs are already said to be holding talks over Joao Palhinha, Tonali, and Fernandes. Then, De Zerbi also wants to strengthen his frontline, with a new left-winger, right-winger, and a centre-forward wanted. Tottenham will surely need to make some more room in their squad if further new players are to arrive, with major doubts over the future of captain Cristian Romero. The Spurs skipper has been linked with a move away from the Tottenham Hotspur Stadium for months now, and the arrival of two new centre-backs only hints more that he could be on his way. In midfield, it has been claimed by David Ornstein that De Zerbi wants to sign both Tonali and Fernandes for his midfield, and if that was to happen then surely there would be one or two exits in midfield as well. There could be doubts raised over the likes of Pape Matar Sarr and Lucas Bergvall, who has attracted interest from other Premier League clubs in the past. In attack, Mathys Tel has been linked with a move away from the club but De Zerbi is said to have blocked any transfer for the Frenchman, while Richarlison is linked with a move away from the Tottenham Hotspur Stadium in most transfer windows. Tottenham Hotspur's summer transfer business is expected to be busy, with the club looking to spend big to strengthen their squad. The club has already spent just over £50m so far, and that number could soon go up significantly. Jan Paul van Hecke's deal from Brighton and Hove Albion is worth £52m, and more big-money signings could be on the way. Tottenham Hotspur's fans will be eager to see who the club signs next, with the new season just around the corner.