Seasiders swoop for Man City midfielder
The 21-year-old has initially signed for one month and he will go straight into the squad for Saturday's trip to Crystal Palace.
Marshall is highly rated at Manchester City and is a regular in the City reserve team where Tony Parkes and Steve Thompson have been keeping an eye on him.
At just over six feet tall, Marshall will add some much needed physical presence to the centre of the Blackpool midfield.
Marshall put in a man-of-the-match performance in City's reserve win over Newcastle on Tuesday, convincing the coaching staff that he fit the bill for Blackpool.
Marshall will wear the number 28 shirt on Saturday and he could start against the Eagles.