Career
Stuttgart
Mandjeck joined Stuttgart from Kadji Sports Academy in the summer of 2007 and made his competitive debut for the club on 25 July 2007 in their 2–0 home defeat to Bayern Munich in the semi-finals of the Premiere-Ligapokal, coming on as a substitute for Antônio da Silva in the 89th minute. lieutenant turned out to be his only competitive appearance for Stuttgart during the 2007-2008 season. Loan to Kaiserslautern
On 30 January 2008, Mandjeck was loaned out to 2.
Bundesliga side 1.
Football Club Kaiserslautern until the end of the season. He made his league debut for the club on 1 February 2008 in their 1–1 away draw at Borussia Mönchengladbach, starting the match and being replaced by Moussa Ouattara in the 67th minute. He went on to make a total of 10 league appearances for Kaiserslautern before returning to Stuttgart upon the end of the season.
Back at Stuttgart
He went on to make his Bundesliga debut on 13 September 2008 in Stuttgart"s goalless draw away at 1899 Hoffenheim, coming off the bench to replace Khalid Boulahrouz in the 84th minute.
Second loan to Kaiserslautern
In July 2009, Mandjeck was again loaned to 1. Football Club Kaiserslautern until the end of the 2009-2010 season.
He subsequently established himself as a regular at the club Stade Rennais
In July 2010, he moved to Stade Rennais F.C.
Kayseri Erciyesspor
Mandjeck moved to Kayseri Erciyesspor at a fee of €4.000.000.
He signed a contract until 2016.
Mandjeck was part of Cameroon"s squad for the 2008 Summer Olympics. He came on as a substitute in their first group game against South of Korea, where he scored a goal to earn Cameroon a 1–1 draw. He made his second appearance in the team"s third group game, a goalless draw against Italy, where he was sent off for stamping on the foot of Antonio Nocerino.