Diego Simeone reportedly is keeping tabs on Manchester United Midfielder.

The Spanish side is set to sign back Diego Costa once again when the transfer window re-opens in January. And it looks like the Argentine is looking to strengthen his team half way through the season.

Diego Simeone re-signing Diego costa

Reports suggest that  Diego Simeone has been keeping tabs on Ander Herrera, with his contract expiring at the end of the season and no news of Mourinho offering him a new deal has built up a lot of transfer rumors around him.

Diego Simeone Targetting Ander Herrera

With the likes of Real Madrid and some European Giants interested in signing the Spanish midfielder. Could either of the Madrid side tempt him to return to Spain? Only time will tell.