Leeds United are in talks to sign midfielder Stuart Dallas from Brentford, according to Sky sources.
Motherwell have signed Middlesbrough goalkeeper Connor Ripley on loan.
Sloth has put pen to paper on a three-year deal after Leeds had agreed a fee, believed to be around £600,000, with Danish club Aarhus last Thursday. The 22-year-old is the Yorkshire club's 12th summer signing.
The midfielder has made eight appearances for Denmark after making his senior international debut in 2012 and was a starter in their 1-0 friendly defeat to England in March at Wembley.
Sloth has gained plenty of top-flight experience in Denmark, having first appeared in Superliga as a 17-year-old.
He had one year left on his contract with Aarhus, who were relegated from the top-flight last season.