Centre-half Zakuani has missed Posh's last three matches while away in South Africa.
Darren Ferguson's side were beaten 3-0 by Norwich in the FA Cup, lost 2-1 at Nottingham Forest and drew 1-1 at home to Hull in his absence.
DR Congo had to beat Mali in their final group match to qualify for the quarter-finals but could only manage a 1-1 draw despite going ahead in the opening minute.
Zakuani is expected to arrive back in England on Wednesday and go straight back into the squad to face the Clarets at London Road on Saturday.
- Sports & Recreation
- Darren Ferguson