Confirmed : Thomas Tuchel comes two great Chelsea stars are leaving this summer ,as the announce their departure,bye bye from old trafford.

 Chelsea's defensive pair Cesar Azpilicueta

 and Marcos Alonso are both keen on a move

 to Barcelona this summer, according to reports

 in Spain - in a move that see Thomas 

Tuchel needing almost an entirely new 

back line.

The Spanish duo have been mainstays at 

Stamford Bridge - with Alonso joining 

in 2016 while captain Azpilicueta has 

been on their books since the 2012-13 season.

Azpilicueta came close to leaving Chelsea 

on a free transfer this summer before penning

 a new one-year extension, while left-back 

Alonso's deal will finish at the end of 

next season.

And Mundo Deportivo report that Barcelona

 are ready to pounce on their contract uncertainty

 and to to lure them to the Nou Camp this

 summer.

It say the Spanish duo are 'seduced by 

the idea of wearing Barca colours' and 

'want to come' and play for boss Xavi

 next season.

However, it adds that Barcelona have 

a 'problem to negotiate' with 

Azpilicueta  loyal to the club after a 

decade at Stamford Bridge and having 

a 'moral obligation' not to force a move away.

Azpilicueta remains a 'very interesting

' player for Barcelona given his versatility

 across many positions in defence, 

it says, and it is 'very clear that they 

want to try to sign him' at some point.

On Alonso, the report claims the Spanish

 left-back is 'looking forward to playing 

for Barcelona' and that he is optimistic 

the club will let him join them for

 a 'low price'.

Should both players end up leaving this 

summer, it would leave boss Thomas

 Tuchel searching for an almost 

entirely new backline.

Centre-backs Antonio Rudiger and

 Andreas Christensen are already set

 to depart on free transfers - with the 

former in line for a move to Real Madrid

 and the latter also reportedly signing

 for Barcelona.

So if Azpilicueta and Alonso follow 

them out the door that will mean 

Tuchel will need a new left-back, three

 centre-backs as well as cover for right

-back, given Azpilicueta's ability to play there.