The youngster helped Huddersfield to promotion last season but had his loan deal cut short this year due to injury
The England under-21 international spent much of the last 18-months on loan at Huddersfield Town, who he helped win promotion to the Premier League last season.
Unfortunately, due to injury, the youngster has made only five appearances for Huddersfield this season and had his loan deal cut short a the beginning of January.
Derby County (@dcfcofficial) 1 February 2018
In total, Palmer made 32 appearances for the Terriers, scoring five goals in the process. He will be a welcome addition to Gary Rowett's attacking options, especially in the wake of forward Johnny Russell's departure to the MLS.
Palmer enjoyed a highly impressive career as a Chelsea youth player, picking up five trophies including two FA Youth Cups and two UEFA Youth League titles.
The Rams are due to play Brentford on Saturday and Palmer will be hopeful he can make an instant impact and help keep Derby near the very top of the table with the business end of the campaign fast approaching.