While the Senegal international is still technically training with the senior squad, the Italian coach confirmed he will no longer feature and is available for transfer.
"He is training with us (the first-team squad), but he is not going to be involved. You know the situation already. The window transfer is open. He can leave, and we'll see,” Maresca told the media.
Jackson is already suspended for Chelsea’s season opener against Crystal Palace this Sunday due to the red card he received against Newcastle at the end of last season.
Even without the ban, Maresca’s remarks indicate he would likely have been sidelined anyway.
