The Brazilian described his arrival at Chelsea last summer as a "dream move" and had high hopes of being a key player for Mourinho this season. However, after just 6 starts in the Premier League, he hasn't found the level of protagonism he was expecting.
The suggestion from The Telegraph is that Filipe Luis may head back from whence he came, namely Atlético Madrid, with claims they are actively monitoring the 29-year-old's situation. Whilst such a move may be alluring to the player, given he realised the best years of his career at the Vicente Calderón, the realities are likely to be somewhat different.
A certain factor which makes it difficult to see Filipe Luis heading back to Atlético Madrid is given they replaced him with not one, but two players: Guilherme Siqueira and Cristian Ansaldi.
Siqueira joined from Granada for €10 million, whilst Ansaldi is on-loan from Zenit with an option to buy. There's also a third player who can operate on the left of the Atlético defence when required, with Jesús Gámez.
Perhaps the most important aspect that reduces the chances of Atlético Madrid opening the door for Filipe Luis, is that whilst they may have made £15.8 million by selling him to Chelsea, they were far from happy with the circumstances.
Club president Enrique Cerezo was already resigned to losing Diego Costa to Chelsea, but at a price that suited all parties. When it came to Filipe Luis however, the player angered Cerezo with his attitude, effectively demanding a move and on top of that, for much less than the club valuation.
For the latter reason alone, unless the Brazilian player or his representatives are tremendously skilled at rebuilding burned bridges, a return to Atlético Madrid couldn't be any less likely. Indeed, as far as Cerezo was concerned, Filipe Luis didn't just burn his bridges, he napalmed them.
Whatever happens, clearly Filipe Luis has much pondering to do at the end of this season. Unless he can gain assurances from Mourinho of a more important role in the team, he could indeed be looking to see if the grass is greener elsewhere. Heading back to La Liga could remain an option, as that's where he spent the best years of his career, but his choice of clubs will be very limited and he'd have to take a significant drop in wages.