Mueller scored a bizarre own goal as Bundesliga leaders Bayern Munich were held to a 1-1 draw by Bayer Leverkusen on Saturday, while Angelino salvaged RB Leipzig a crucial point against top-four rivals Freiburg.
He joined Leipzig from Man City in January last year and an initial 18-month loan deal became a permanent transfer a fortnight ago.
Everton sign midfielder Abdoulaye Doucoure from Watford; Manchester City's Angelino makes loan return to RB Leipzig
Everton reportedly spent 20 million pounds ($25 million) on Abdoulaye Doucoure, who has signed a three-year deal with the option of a fourth season.
Bundesliga: Erling Haaland scores yet again as Borussia Dortmund beat Werder Bremen; RB Leipzig win big against Schalke
Erling Haaland scored yet again to help Borussia Dortmund beat Werder Bremen 2-0, and RB Leipzig followed by routing Schalke 5-0 to keep the pressure on Bundesliga leader Bayern Munich.