Rumours have been rampant throughout this summer regarding the future of Chelsea star Diego Costa, with a host of European teams supposedly interested in the prolific front man.

Atletico Madrid have long been thought of as the front-runners for the Chelsea striker's signature, with rumours suggesting that Costa would be happy to leave the Blues and head back to Spain.

Well today Diego Costa has potentially dropped the biggest hint yet that he could be on his way out of Chelsea this summer, after posting a very interesting Instagram picture.

The image, featured below, is of Costa alongside some of his team-mates, with the caption "thank you very much for all my friends!!!".

The message has been inferred by a number of Chelsea fans as a goodbye to his team-mates, thanking them for his time with the club as he prepares to leave.

Whilst that message is easily received by the picture, we think Chelsea fans need to slow down a little bit. Remember, Diego Costa's English isn't great; and in all likelihood he is simply sharing a picture of himself and his friends.

On top of that, recent reports have suggested that a potential transfer is OFF, indicating that Costa will likely remain at the club this summer.

It will be an interesting next few hours as Chelsea fans no doubt await news of a potential transfer... although we don't think there is anything to worry about just yet. But you never know...

Thank you very much for all my friends!!! A photo posted by Diego Costa (@diego.costa) on

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