A Chilean international for a full decade, Tello represented the country at the 2010 World Cup and the 2007 Copa América.

He quickly made a good impression, being named the best midfielder in the country in 2000 and being transferred to Sporting Clube de Portugal for a fee of €7 million in January of the following year, alongside compatriot Mario Cáceres; at the time, it was a club record for the Primeira Liga side.

[2] After a slow start, Tello eventually became an important first-team member – although he would be used mainly as a substitute – and even saw some time at left back.

[5] On 25 July 2010, aged 30, Tello left Beşiktaş but continued in the Süper Lig, signing a three-year contract with Eskişehirspor.

[8] A full Chilean international since his early 20s, Tello represented the country at the 2007 Copa América, where the national side exited in the last-eight after a 1–6 loss against eventual winners Brazil, and at the 2010 FIFA World Cup in South Africa, playing in the second half of the round-of-16 0–3 defeat to the same opponents.