It has been reported by the British tabloid that Karanka wants to use the services of the young defender for next season and has already spoken to Chelsea manager Jose Mourinho about it.
If Middlesbrough do get promoted to the Premier League next season, then they would be able to sign only one player from Chelsea.
The Sun claims that Karanka wants to make Ake that player, but if Middlesbrough sign him on a permanent deal, then he would look to retain the services of Patrick Bamford on loan for the 2015-16 campaign.
Ake is rated as a talented young player who is only 20 years of age, but it does not look likely that he will be able break into the Chelsea starting line-up soon.
The youngster recently completed a one-month loan spell at Championship club Reading and is now back at his parent club Chelsea.
One suspects that whether or Middlesbrough get to sign Ake on a permanent deal will depend on the youngster, who will probably want to have the chance to play for one of the biggest clubs in the world - Chelsea - in the coming years.
A loan move appears to suit all parties. Boro will get a young defender with potential, and Chelsea will get to see how Ake performs in the Premier League on a regular basis.
For the player himself, the loan spell would represent an opportunity to show Mourinho what he is capable of.