Udoh was selected for the senior Nigerian national team for both the 2019 FIBA World Cup and the 2020 Olympic Games.

[7] Udoh was selected with the sixth overall pick in the 2010 NBA draft by the Golden State Warriors.

Because of a wrist injury,[8] Udoh did not make his NBA debut until December 11, 2010, against the Miami Heat in the final three minutes of the game, scoring two points.

On November 21, 2011, Udoh signed with Bnei Herzliya of Israel for the duration of the NBA lockout.

[9] In December 2011, he returned to the Warriors after managing just one game for Bnei where he recorded 22 points, 16 rebounds, 3 assists and 4 blocks.

On March 13, 2012, Udoh, along with Monta Ellis and Kwame Brown, was traded to the Milwaukee Bucks in exchange for Andrew Bogut and Stephen Jackson.

[23] However, after having ousted Lietkabelis, Ulm and Valencia in the first three rounds of the playoffs, on 11 May 2022, Virtus defeated Frutti Extra Bursaspor by 80–67 at the Segafredo Arena, winning its first EuroCup and qualifying for the EuroLeague after 14 years.

[24] However, despite having ended the regular season at the first place and having ousted 3–0 both Pesaro and Tortona in the first two rounds of playoffs, Virtus was defeated 4–2 in the national finals by Olimpia Milan.

[33] Udoh enjoys reading and runs a public, mostly online book club in his spare time.