The main aim of a transfer is to improve your squad and ideally your starting XI. Matt Doherty does both for Spurs. The PL's second most creative right-back in the past couple of seasons and at a bargain price. He's homegrown and is no gamble as he has impressed in this league.
He fits the advanced right-back role Mourinho is looking for perfectly, with the LB and CBs a three in possession. The plan for Spurs this summer has been to do the smart deals Mourinho believes will seal gaps in his squad and get the best out of an otherwise talented bunch.
It's not a sexy £100m signing but it's a smart one and Tottenham proved last season that spending a lot of money didn't solve their problems. It's spending money in the right ways that does that. Doherty could prove to be one of the bargains of the window and Spurs aren't done.