It was no secret Chelsea were after a new central defender during the transfer window. The Blues failed to lure John Stones away from Everton, having chased the England international throughout the summer.
The 26-year-old Senegalese international moved to Stamford Bridge for £2.7 million on deadline day as a last resort for the Blues.
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Having missed out on top targets, the defending Premier League champions ushered in a player that is unlikely to challenge the starting line-up, to bolster their ranks.
This was echoed by Mourinho's decision to leave his new signing out of Chelsea's 23-man squad for the Champions League.
It has been claimed by Portuguese newspaper O Jogo, that the West London club also had a bid rejected for Benfica defender Luisao.
The publication claims Chelsea offered €5m for the the 34-year-old former Brazil international, but Portuguese club said there was no way their captain would be leaving.
Luisao has been at the Lisbon club for 12 years and has racked up 458 appearances and claiming four Primeira Liga titles, including back-to-back success' in the last two seasons.
WHAT ABOUT YOUTH?
It appears Mourinho was desperate to strengthen his centre back options before the window closed, but the signing of Djilobodji will hardly strengthen a Chelsea back-line that has been surprisingly open this season.
He has hardly pulled up any trees during his time in France, plying his trade in Ligue 2, before battling relegation in the top flight for the past two seasons.
With 33 players out on loan from the Blues, it makes you wonder why they did not promote an academy graduate to fourth, maybe even fifth choice centre-back.
While Tomas Kalas, Nathan Ake and Andreas Christensen will all benefit from first-team experience, one of them could have gained as much from being in and around the first-team and learning from the likes of John Terry and Gary Cahill.
You never know, Djilobodji could prove everyone wrong and become a star for the Blues, but it seems highly unlikely.