After his brilliant performance in the U-17 World Cup in Peru, in which Mexico was champion, he accepted an offer from FC Barcelona and headed to Spain.

Once there, in La Masía, they discovered that Juárez was in the calendar year of majority, so his condition as a foreigner only allowed him to play in the first team or in FC Barcelona B.

After winning the 2005 under-17 World Championship, playing a key role in defense, he was snapped up by Barcelona along with national teammate Jorge Hernández in 2006.

[5] On 26 July a £2 million transfer was agreed and Juárez signed a four-year contract with The Hoops, making him the first ever Mexican player to play in the SPL.

[10] Juárez was close to agreeing a loan move to Serie A side Brescia Calcio in the January 2011 transfer window but the deal fell through.

[7] On 26 July 2011, after weeks of speculation, Juárez was loaned out to La Liga side Real Zaragoza,[11][12] where he was reunited with former Mexico national team coach Javier Aguirre.

[14] On 5 June 2012 it was announced that Juárez had transferred to Club América in Mexico for an undisclosed fee, after failing to cement his place in the starting line-up for Celtic, and after his disappointing stint for Real Zaragoza.

[25] On 22 September 2010, it was announced that Juárez and Mexico teammate Carlos Vela were banned from international duty for six months for their involvement in a party in Monterrey following a game with Colombia two weeks earlier.

[26] Juárez scored his first national team goal in the 5–0 win against El Salvador in the opening match of the 2011 CONCACAF Gold Cup on 5 June.

[27] Juárez started his managing career at Major League Soccer club New York City FC as technical assistant under Ronny Deila.

[33] A week later, he led Atlético Nacional to its 18th league title, making him one of only three managers to achieve the double in Colombian football.