The on-loan Ipswich striker suffered a slight hamstring injury during last weekend's 3-0 defeat at Nottingham Forest.
Calvin Andrew, who was recently recalled from a loan spell at Millwall, or youngster Wilfried Zaha will step in if Counago is ruled out.
Alex Marrow will also be checked over after missing the last three matches with an ankle problem.
Fellow midfielder Darren Ambrose managed 82 minutes at Forest on his return from a leg injury and will be in the starting line-up again.
Young defender Lee Hills is still on the sidelines with a knee injury.