Once again this season, Manchester United and Chelsea have entered their campaigns with their reliable left-backs at hand.
Patrice Evra and Ashley Cole have been a main-stay in their sides over many years, but soon their time at the top could be up.
It was no secret that this past summer David Moyes was in search of a new sided defender, as he searched for replacements for the French international.
And, after failed attempts to lure Leighton Baines and Fabio Coentrao to Old Trafford, Evra has been given another season as United's main-man.
As for Cole, Mourinho still seems to trust his left-back, but at 32-years-old the England international is only going to be in decline from here.
So soon, perhaps next summer, Mourinho will have to reassess his options. And, that could well leave Mourinho and Moyes going head-to-head for the best left-backs around.
One starlet that could well be on the radar of both the managers could be Southampton ace, Luke Shaw.
The English youngster looks a great prospect and is yet another Saints academy player to shine on the south-coast.
He could well be part of a bidding war between the Manchester and London outfit next season, and would act as the ideal long-term replacement for either Evra or Cole.
United and Chelsea have been blessed with consistency in their left-back position in recent years, and must enter the market next summer.
Unfortunately for United, the likes of Fabio and Alexander Buttner just won't cut it and for Chelsea, Ryan Bertrand has a long way to go to really prove himself at Stamford Bridge.
It looks likely that both managers will have to search the market for a replacement for the pair, and Moyes and Mourinho will have to work hard in the window if they are going to be able to bring in as talented left-backs as the ones they are eventually going to be leaving behind.
For now though, Evra and Cole will continue to play key role for their sides, but they may soon be faded out as new blood comes in.