Brentford defender Mads Roerslev has signed a new four-year deal.
The 20-year-old Danish full-back has made 10 appearances for the Bees this season after joining from FC Copenhagen in August.
"We are very pleased that Mads has signed a new contract with us," boss Thomas Frank told the club website.
"He had made great progress since the summer and has shown the benefits of our B Team. He has earned his place in the first-team group."