MLS' Philadelphia Union signs 14-year-old phenom in historic deal

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The youth movement is on for the MLS' Philadelphia Union.

The soccer club signed 14-year-old prodigy Cavan Sullivan on Thursday in a historic deal.

Although the conditions were not made public, the pact is said to be the largest homegrown deal in league history.

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Philadelphia Union midfielder Cavan Sullivan poses with his jersey during a press conference announcing his professional contract at Subaru Park.  (Caean Couto-USA TODAY Sports)

According to the league's site, "a club may sign a player to a contract without subjecting him to the MLS SuperDraft if the player has been a member of that club’s youth academy for at least one year and has met the necessary requirements. Players joining MLS through this mechanism are known as Homegrown Players."

The contract allows the Union to continue to develop Sullivan and benefit in the short term from his ability, before profiting when he likely heads overseas to the Premier League. It also allows him to stay at home for a few more years.

The Philadelphia Union Under-17 squad player Cavan Sullivan plays during the Generation Adidas Cup at IMG Academy. (Jeff Swinger-USA TODAY Sports)

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Sullivan (14 years, 224 days) is the fifth-youngest player to sign a first-team contract in MLS history. If he plays for the Union before July 29, he'll become the youngest player ever to appear in a match. Freddy Adu was 14 years, 306 days old when he debuted for D.C. United in 2004.

Sullivan is considered one of the best young American players. In a match last