The Brazilian striker will complete a move to El Madrigal, with Luciano Vietto about to complete a move in the opposite direction to Atletico Madrid.
Baptistao is reportedly wanted by Aston Villa, but now Dortmund have shown an interest in him.
Rayo Vallecano striker Leo Baptistao will be sidelined for the next six weeks after suffering a tear in his right hamstring.
Swansea City have reportedly identified three strikers that they will be looking to sign in the summer.
Reported Aston Villa target Leo Baptistao has now gone eight games without a goal.
Brazilian forward Leo Baptistao has been linked with a move to Aston Villa, but would he suit a switch from La Liga to the Premier League?
What Aston Villa fans should know about the Atletico Madrid striker said to be on Tim Sherwood's radar.
Tim Sherwood is keen on bolstering his attacking options at Villa Park.
Leo Baptistao is finally proving his worth once again in La Liga. Could he be the next Diego Costa?
Leo Baptistao was once courted by several Premier League sides - but he has struggled to live up to that billing ever since.