With just a few weeks to go until the new Premier League season gets underway, Diego Costa's future at Chelsea remains the subject of much discussion.
A lacklustre 2015/16 campaign, combined with less than decisive statements from new manager Antonio Conte in recent days, have seen the Spanish striker heavily linked to a return to former club Atletico Madrid.
And now Filipe Luis - a player who also has both Chelsea and Atletico on his resume - has weighed in on the debate. The former Chelsea left back today talked up just why Costa's return to Madrid makes so much sense, and why he'd love to see it happen.
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"He has been the player who has given me the most advice in my career and I love him like a brother," Filipe Luis explained to Marca.
"He has always had this love for Atletico. He has always followed us and has visited his friends and I have no doubt that he would be very happy here.
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"He has been the best No. 9 in the world and his return here depends upon the club. I always want him on my team, so I hope that I can play once again with him."
Luis, of course, endured a tough season in west London after arriving from Atletico in 2014 for around £15 million before re-signing with the La Liga club.
Now, with his good friend and former teammate also going through a slump in his Stamford Bridge career, the Brazilian is doing his best to urge Costa to join him in returning to Diego Simeone's side.
Just how likely a move to Atletico is for Costa likely hinges on just what else Chelsea are able to do in transfer market over the next few weeks.
Conte admitted this week that he couldn't guarantee the 27-year-old's long-term Chelsea future, and there is a growing belief that the Blues are set to re-sign Romelu Lukaku from Everton before the new season gets underway.
With fellow Belgian Michy Batshuayi also having arrived this summer, that could leave Costa on the outside looking in on the starting lineup.
Obviously, sitting on the bench at Stamford Bridge wouldn't make the notoriously volatile striker particularly happy.
In contrast, a move to Madrid and the Vicente Calderón Stadium would bring a smile to Costa's face - at least according to one of his closest friends in football.