In April 2014 it was announced that he was part of an 8-man shortlist to replace Eric Nshimiyimana as Rwanda manager.[6]
In June 2014, he took the control of Romanian former champions Oțelul Galați. He was sacked only three months later after a single win in seven games.
On January 18, 2017 it was reported that Weiß was appointed by the Mongolia national football team as their head coach[7] during a meeting of the Executive Committee of the Mongolian Football Federation on January 17.[8] Weiß formally accepted the 1-year deal on 27 March 2017.[9] He immediately began preparations to lead the national under-23 team in 2018 AFC U-23 Championship qualification.[10]
After three years, he departed from the coaching position of Mongolia, where he earned respect for his supporting role on developing Mongolian football.[11]
In June 2023, Weiß returned as coach of the Philippines.[12] His second tenure ended with the appointment of Tom Saintfiet in February 2024.[13]