It all started when David Moyes was spotted taking in a Bayern match in January - sitting alongside the German international’s agent.>
When it emerged Kroos’ contract talks over an extension to the final 18 months of his current deal had reached a stalemate it seemed he might just be on the way.
However this week has seen some interesting developments in this story - not least the sacking of Moyes, the man who had identified him as a top target, by Manchester United.
But regardless of that it seemed as though Kroos planned on a Bayern stay.
Last week saw his agent talk about reports of a contract offer already being tabled for the player:
In quotes published by Sport 1, Volker Struth said, “There is no official contract offer presented. Lastly, there is no need to submit an official offer; because Toni Kroos will play at Bayern at least until 2015.”
And Struth is not the only person who thinks he should stay at the Allianz Arena.
Earlier in the month saw Jupp Heynckes, his former manager at Bayern, tell German media he had spoken with the player over his future - and had told him to stay in Bavaria:
"I spoke with Toni. If he takes my words seriously, he will stay. A team like Bayern are not currently available in Europe.
"He would be well advised to extend. At present he has a good offer from Bayern. Toni knows also. I hope that his advisor also knows."
And now Kroos has addressed those comments from his ex-coach.
As Bayern ready themselves for a Champions League semi-final tie against Real Madrid German sports daily Bild took the opportunity to speak to the Germany international before the game - and asked him about the recent quotes from his ex-coach.
"Very important. He [Heynckes] was one of the most important coaches I had. We have had and will always have a good relationship. So a piece of advice is important. In the end, it's about me and my future. There are a few people whose advice you value, and that includes Jupp Heynckes. It was exciting to hear what he thinks. "
Again that doesn’t sound promising for any hope of United snapping him up. Heynckes was clear - Kroos should stay, although he also did not exactly move to bequeath himself to Bayern for the foreseeable future.
This will continue to rumble on as long as Kroos refuses to stoke or extinguish the fires of this constant rumour.