Zhang Jiaqi started his career in Le Mans' youth academy. He played for their reserve team before being signed to the first team in 2012. On 8 February 2013, Zhang made his Ligue 2 debut for Le Mans in a 1–1 away draw against Clermont Foot. After starting three straight games in a row for Le Mans, Zhang scored his first goal, which ending up being the match-winning goal in a 3–2 win against Niort on 22 February 2013. Zhang became a mainstay in the team's starting eleven for the rest of the season, however Le Mans was relegated to the third tier Championnat National on the last day of the season.