The suspect, 27-year-old Mohamed Hussein Said, is accused of providing material support to "foreign terrorist organizations," according to a statement from the Justice Department.
Said, from Nairobi, Kenya pleaded guilty to sending money and recruits to Al-Qaeda, its affiliate Al-Nusra Front, and al-Qaeda-linked Shebab militants in Somalia.
He was indicted on 15 counts alongside Gufran Ahmed Mohammed, a naturalized US citizen and resident of Saudi Arabia.
The men were arrested together in Saudi Arabia last year and taken to Miami by US Federal Bureau of Investigation agents.
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"Said also served as a contact and recruiter of foreign fighters from the United Kingdom and elsewhere traveling to Somalia to join Al-Shebab."
The pair also allegedly said they would support al-Qaeda and al-Nusra Front fighters by sending recruits to fight in Syria, according to the Justice Department.
The charges against the two men stemmed from a Miami-based investigation involving an FBI employee who enlisted the pair in a financial scheme to back the terrorist organizations, the Miami Herald newspaper reported earlier this year.
If convicted, he faces a maximum statutory sentence of 15 years in prison.