Erden played with Darüşşafaka in the Turkish Basketball League in 2003–04 season, appeared in one game in which he recorded one point and two rebounds.

Next season, Erden played with Partizan Belgrade in the Adriatic League and averaged 4.6 points and 3.2 rebounds.

In 2004–05, he also appeared in seven Yugoslav Basketball League games, averaging 1.7 points and 0.7 rebounds in 4.4 minutes a contest.

[2] On July 5, 2010, Celtics signed Erden to a one-year minimum contract with a team option for 2011–12.

In that game Erden played a game-high 41 minutes recording 10 points, 7 rebounds, 4 blocked shots and a plus/minus rating of +34.

On February 24, 2011, Erden was traded to the Cleveland Cavaliers along with teammate Luke Harangody in exchange for a second-round draft pick.

[4] On June 30, 2012, the Cavaliers extended a qualifying offer to Erden, thus making him a restricted free agent.

[17] On October 2, 2018, Erden signed a one-year contract with BSL side İstanbul BŞB.

[18] On August 20, 2019, Erden signed with 2-year deal with Pınar Karşıyaka of the Turkish Basketball Super League.

[20] On July 10, 2022, Erden signed with Türk Telekom of the Basketbol Süper Ligi (BSL).

[21] On September 23, 2023, Erden signed with Bursaspor İnfo Yatırım of the Basketbol Süper Ligi (BSL).