*Chivas USA, which holds the top slot in the MLS allocation order, has taken “substantial interest” in Freddy Adu, multiple sources tell the Insider. One contact says a Chivas rep met with Adu in Maryland recently. Another says Adu also continues to weigh options in Europe. He is in the final year of his contract with Benfica, which is looking to sell or loan him out. Adu is here in Philadelphia for the USA friendly against Mexico and hopes to resolve his club situation in the next week or two. An MLS deal would undoubtedly require a hefty designated player contract.

*The Insider told you Monday this was going to happen, and now it’s official: Longtime MLS player Jesse Marsch, a 2010 USA World Cup assistant, will coach the Montreal Impact in its inaugural MLS season next year.

*The impact of the U.S. national team coaching change was felt by all of the players but particularly midfielder Michael Bradley, whose father was dismissed after four-plus years. I sat down with Michael for a long chat Tuesday.

For USA-Mexico ticket sales, a Robbie Findley update and Under-20 World Cup results and TV info.....

*At last check, tickets for the USA-Mexico friendly at Lincoln Financial Field in Philadelphia were moving slowly: 25,000-plus. A late uptick and good walk-up will result in a half-full stadium that holds about 68,000 — an alarming low percentage for an encounter between the bitter rivals.

*American forward Robbie Findley, out of the USA picture since last year, scored in the second half and converted during a shootout as Nottingham Forest defeated Notts County following a 3-3 draw in an English League Cup match.

*Under-20 World Cup:

Mexico’s wonderful year of soccer continued with the under-20s advancing to the quarterfinals on penalty kicks against Cameroon after a 1-1 draw. Host Colombia, Portugal and Argentina also moved on. Today’s round-of-16 matches:

Nigeria vs. England 5:45 p.m. ESPN3.com

Spain vs. South Korea 5:45 p.m. ESPNU, ESPN3.com

Brazil vs. Saudi Arabia 8:45 p.m. ESPNU, ESPN3.com

France vs. Ecuador 8:45 p.m. ESPN3.com