喜讯！新斯卢茨基已跟蓉城正式签约，德转官宣确认他下赛季会带队（重磅！斯卢茨基正式加盟成都蓉城，德转官宣其将执教下赛季）

Considering phrasing options

The style mentions that headers are optional and wrapped in …, so I can include them. I need to be careful and not state incorrect facts, like saying "Transfermarkt confirmed." Instead, I should phrase it as, "如果德转已官宣，那..." or "按你说的官宣," or I could simply react without reasserting that information. Let’s get this produced in a way that aligns with the guidelines!