Career
He was selected by the Buffalo Sabres in the 3rd round (89th overall) of the 2007 National Hockey League Entry Draft. Tropp played three seasons (2007-2010) of college ice hockey at Michigan State University with the Michigan State Spartans in the CCHA at the National Collegiate Athletic Association Division I level Tropp"s Moscow State University career was marred by controversy in 2009, when he and teammate Andrew Conboy brutally attacked Michigan Wolverines defenseman Steve Kampfer, in an on-ice incident where Conboy appeared to check Kampfer from behind and Tropp appeared to slash Kampfer in the neck.
Both players were suspended by Spartans head coach Rick Comley for the remainder of the season.
Tropp was honored for his outstanding college play when he was named to the CCHA Second All-Star Team in his final year. On November 4, 2011, Tropp made his National Hockey League debut against the Calgary Flames.
He scored his first National Hockey League goal in his third game on November 8, 2011 against Ondrej Pavelec of the Winnipeg Jets. In a pre-season game against the Toronto Maple Leafs on September 22, 2013, Tropp fought and was knocked out by Maple Leafs" forward Jamie Devane, resulting in a broken jaw and a mild concussion.
On November 27, 2013 the Buffalo Sabres waived Tropp and on November 28, he was claimed by the Columbus Blue Jackets.
On June 30, 2015, Tropp, along with Jeremy Morin, Marko Daňo and Artem Anisimov, were traded by the Blue Jackets to the Chicago Blackhawks in exchange for Brandon Saad, Alex Broadhurst and Michael Paliotta. After attending the Blackhawks training camp, Tropp was re-assigned to the Rockford IceHogs. Despite attending the IceHogs training camp, due to a overload of contract with the Blackhawks, Tropp was re-assigned to the Albany Devils to begin the 2015-2016 season.
Tropp enjoyed a productive tenure with the Devils, scoring 28 points in 51 games before on February 29, 2016, he was traded by the Chicago Blackhawks to the Anaheim Ducks in exchange for Tim Jackman and a 7th round pick in 2017.
He was directly re-assigned to the Ducks AHL affiliate, the San Diego Gulls
Tropp is one of just seven National Hockey League players to wear the number 78. The other six players were Pavol Demitra for the Ottawa Senators (1993-1996), Benn Ferriero for the San Jose Sharks (2009-2012), Evgeny Grachev for the Saint Louis Blues (2012–present), Eric Landry for the Montreal Canadiens (2000-2002), Marc-Antoine Pouliot for the Edmonton Oilers (2006-2008) and Mike York of the Columbus Blue Jackets during the 2008-2009 National Hockey League season.