Middlesbrough have signed Preston defender Darnell Fisher for an undisclosed fee on a two-and-a-half-year contract.
Fisher is the second player to join Boro this week after winger Yannick Bolasie joined on loan on Thursday.
"He's an athletic type who's desperate to come and do well with us," boss Neil Warnock told the club website.
Find all the latest football transfers on our dedicated page.