The Liverpool Echo among others have recently linked Everton with the Dutchman but, should they end up signing Mori - and thereby reduce their need for Van Dijk substantially - it may in fact benefit Southampton more than it does Celtic.
Indeed, Mori's signature could give the Hoops one less suitor to fend off - but it will also reduce the competition for the Saints, potentially avoiding a bidding war and keeping the price down.
After all, where Everton have been linked, Southampton have been even more so. And, according to Sky Bet, they are 1/3 favourites to sign the 24-year-old.
As has been repeatedly stated, much depends on how Celtic get on against Malmo in their Champions League play-off. However that clash unfolds, though, Everton's interest in defenders other than Van Dijk could be seen as a blessing for the Bhoys - but may, in all likelihood, make life easier for Southampton when it comes to prising him away from Parkhead.