Arsenal's Sanchez had looked close to a move to Premier League rivals Manchester City, for an initial £55m. That deal was dependant on Monaco's Lemar joining the Gunners as his replacement. The clubs had agreed a fee of about £90m, which would have made him the third most expensive player ever, but the France forward is thought to have turned down that move - which in turn saw the Sanchez deal collapse.
Everton midfielder Barkley, who is currently injured, turned down a £30m move to Chelsea - after reportedly having his medical - despite the fact he has one year left on his Toffees deal, and he will not sign a new contract.
Southampton defender Van Dijk has been training with the club's youth team since trying to push through a move to Liverpool in the summer. The transfer never materialised, so he will have to stay at St Mary's until January at least.
Chelsea striker Costa is thought to be in his native Brazil after being told he was not in boss Antonio Conte's plans. Unless his situation changes, he will not be playing any football for four months at least.
Leicester winger Mahrez was allowed to stay behind by Algeria to "formalise" a move, but it does not appear that anyone actually made a bid to sign him, with Roma not following up interest from earlier in the window.
Manchester City ended their interest in West Brom defender Evans after they could not sell Eliaquim Mangala to Crystal Palace.
