Celtic boss Ronny Deila says keeping his best players will take priority over acquisitions in the transfer window.
Chelsea striker Fernando Torres is understood to be set for a return to Atletico Madrid, according to Sky sources.
The Championship club made an audacious move earlier this week to persuade the former Tottenham, West Ham and Middlesbrough striker to head to Oakwell.
According to Sky Sports, they have now agreed terms with the player, who is a free agent after leaving Zamalek earlier this summer.
The 29-year-old will undergo a medical in South Yorkshire on Monday before signing a one-year deal which will have an option to extend.
Should Mido sign on the dotted line, it would represent a marquee signing for Tykes boss Keith Hill.