[1] While at college, Arena also spent time playing for USL PDL club's Washington Crossfire and Seattle Sounders FC U-23.
[2] Arena was selected by Houston Dynamo with the 18th overall pick of the 2013 MLS Supplemental Draft.
[3] He made his professional debut with Houston on May 29, 2013, in a US Open Cup game against FC Tucson.
In total, Arena made 16 appearances during the loan and was named the club's Defensive Player of the Season after making a late play-off push.
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