"We are hopeful Sav will be fit for the weekend. He has been doing some running this week and everything is looking okay
"We will have to see what happens when we speed up his rehabilitation in the latter stages of the build-up to the match. He is a very valuable member of our squad and we want him back as soon as possible."
Meanwhile, Northern Ireland international Johnson, who missed Blues' 2-0 victory over Sunderland at St. Andrew's last weekend through illness, is also set return for the trip to the Valley on Saturday.