Two years later, limited opportunities with the first team saw him move to FC Thun, where he won promotion to the Nationalliga A and established himself as a good prospect.

After the retirement of veteran striker Thomas Häberli, Wölfli was named club captain by manager Vladimir Petkovic prior to the 2009–10 season.

[2] He was part of the Young Boys squad that won the Swiss Super League for the first time in 32 years in 2017–18 season.

[3] Wölfli retired at the end of the 2019-20 season, after helping Young Boys win their third consecutive Super League title.

After his injury on 9 December he lost his number one status at Young Boys and from then on did not play for Switzerland anymore.