Premier League clubs have spent an estimated \u00a3300m during the first week of the summer transfer window. By comparison, \u00a3870m was spent during the nine weeks of last summer's window. Business analyst Deloitte expects gross outlay to rise above \u00a31bn before the window closes on 31 August. A new \u00a35bn three-year television deal, which starts this season, is fuelling "unprecedented" spending amid "unreal" player valuations, football finance expert Rob Wilson told BBC Sport. "There's no questioning the impact of the TV deal," added Sheffield Hallam University's Wilson, who said he had expected spending in the first week of this summer's window to be even higher. Each club can expect to receive between \u00a330m and \u00a350m from the Premier League for 2016-17 as a result of the TV contract, under which Sky are paying \u00a34.2bn and BT \u00a3960m for the rights to show live top-flight matches over the next three seasons. Wilson believes that is driving player values through the roof. "We've seen this trend, over the last two or three deals at least, but we never thought the valuations would go up that much. It's unreal," he said. The combined total spent by Premier League clubs over the summer and winter transfer windows last season was \u00a31.045bn - up from \u00a3965m for 2014-15. BBC Sport based its own estimate on actual fees announced by clubs and on reported figures when the value of a transfer has been undisclosed. Manchester United have been among the biggest spenders, reportedly paying \u00a326m for Borussia Dortmund attacker Henrikh Mkhitaryan and \u00a330m for Villarreal defender Eric Bailly. Neighbours Manchester City bought Dortmund midfielder Ilkay Gundogan for a reported \u00a320m, and also spent an estimated \u00a313.8m on Celta Vigo winger Nolito. Liverpool, one of the biggest gross spenders in 2014-15, paid \u00a334m for Southampton forward Sadio Mane this summer. That deal was announced in late June but clubs can only complete the transfers and register players from 1 July onwards, when the window opens. Champions Leicester have broken their transfer record with a \u00a316m deal for CSKA Moscow striker Ahmed Musa, and have also brought in midfielder Nampalys Mendy from Nice for a reported \u00a313m and German goalkeeper Ron-Robert Zieler from Hannover 96. Even clubs promoted from the Championship have spent heavily. Middlesbrough can count Denmark international winger Viktor Fischer, signed from Ajax, among their new arrivals, while midfielder Marten de Roon was signed from Atalanta for a reported fee of around \u00a312m.