That's just rumours though, Bremen's CEO said there was no contact and while it's obvious he'd say that regardless of whether it's true or not it would be pretty difficult to set up a valid contract in that vein.
Nevermind the game vs San Marino just look at his performances in the Bundesliga to see his quality. He's making his mark in every game and looks a lot more mature than he used to, also his first touch and even more so his work rate are on a different planet compared to Ox.