Portsmouth are sweating on the fitness of Liam Lawrence ahead of their match with Crystal Palace.
The influential winger limped out of Saturday's 1-0 win over Barnsley with a recurrence of a calf injury and will undergo a scan to discover the extent of the problem.
Aston Villa loanee Jonathan Hogg returns from suspension and could come back in if Lawrence is ruled out.
Skipper Aaron Mokoena may have to make do with a place on the bench again with the defence having kept back-to-back clean sheets in his absence, although he could step into the midfield.
Kanu could earn a recall to the starting line-up after he came on as a second-half substitute to grab the winner against the Tykes.
Fellow striker Danny Webber (cruciate) is still out.