Toni was dumped to the youth team by Van Gaal earlier this season before getting his escape to Roma on-loan in January.
The World Cup winner said: "I hope to finish my last three matches well with this Giallorossi shirt. Then we'll see.
"I still have a contract with Bayern and a good relationship with the club, but there is still Van Gaal, who remains difficult for me. Everyone knows that the Dutchman and I had some problems.
"We will have to sit around a table and decide the best for everyone. It will be decided together, they have helped me a lot to get me to Roma, for this I thank them."