Morrison missed the promotion-clinching 3-2 win at Doncaster nursing tight hamstrings but is now back in training and likely to be included in Roberto Di Matteo's matchday 18.
However, the injured trio of right-back Gianni Zuiverloon (thigh), winger Jerome Thomas (hamstring) and defender Gonzalo Jara (broken metatarsal) continue to miss out.
Striker Roman Bednar needs to undergo a hernia operation but will do so in the summer, meaning he is available to face a Boro side who will be looking for all three points to keep alive their hopes of a play-off spot.
