The 19-year-old made just one league appearance for West Ham last season following his move from Manchester United and is now being sent out to gain first team experience
The 19-year-old joined the Hammers last January from Manchester United, after incurring the wrath of Red Devils boss Sir Alex Ferguson over his perceived lack of discipline.
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He is now being to sent to join up with Lee Clark's side in order to gain experience as his parent club attempt to consolidate their top-flight status.
The Wythenshawe-born midfielder made three League Cup appearances for Manchester United prior to his move to east London.
His short career has been blighted by several clashes with the law including, most recently, a 12-month referral order for two counts of witness intimidation.
Morrison was also handed a £7,000 fine by the FA just a month after joining West Ham after using homophobic language in a message on social networking website Twitter.
Birmingham will kick-off their season with a League Cup tie against Barnet next week.