HITC Sport understands that agent's asking price was too high.
Morrison is out of contract at The Hawthorns and he has been considering his options, which has included listening to an offer from Boro.
Middlesbrough were keen to bring Morrison back to the club he started his career with and they offered him a similar deal to what he is on now - with a substantial signing bonus.
However, HITC Sport understands that Morrison's agents asked Boro for a package worth £76,000-a-week - more than double his current West Brom wage and what the Teessiders were willing to go to.
Boro would have gone to £40,000-a-week for Morrison but they have been upset by the stance of the player's representatives and feel they have not been conducive to getting a deal done.
A source told HITC Sport: "Boro have been shocked by the stance from Morrison's agent, they want him but won't be held to ransom."
One former player who remains in Boro's sights is Lee Cattermole. HITC Sport understands Boro asked about the Teesside-born midfielder, who like Morrison began his career at The Riverside Stadium, last summer and they asked to be kept informed of his situation in January also.
Now back in the Premier League, Boro are in a position to take on Cattermole's substantial wages but they are waiting for Sunderland to give them an asking price; however the club are confident the deal could be done.
In an ideal world, Boro would like to take both Morrison and Cattermole back but it now appears the latter is much more likely to be making the return.