Chelsea have loaned striker Mason Burstow to Championship side Sunderland, who have also signed Zorya Lugansk forward Nazariy Rusyn.
Ukrainian striker Rusyn scored 21 goals in 49 games for Muzhyky.
The 24-year-old has signed a four-year deal for an undisclosed fee, subject to international clearance.
Rusyn began his career with Dynamo Kyiv and also had a stint with Dnipro and Polish side Legia Warsaw.
Burstow said: "It's a huge club with a great head coach [Tony Mowbray] and big expectations.
"I'm here to bring goals to the team and keep supporters on the edge of their seats.