Junior hockey Like his older brother, Sergei excelled in the Belarusian
junior hockey program. Sergei played for HK Gomel in Belarus in 2004–05 (14 points in 40 games) and was drafted in the
Canadian Hockey League (CHL) Import Draft by the
Ontario Hockey League (OHL)'s
London Knights. Sergei was also drafted in the seventh round, 200th overall in the
2005 NHL entry draft by the
Montreal Canadiens, the team that also had drafted Andrei in the first round (10th overall) in the
2003 NHL entry draft. He was traded to the
Nashville Predators on 29 June 2010. Kostitsyn moved to
North America in
2005–06 to play with the Knights and recorded 26 goals, 52 assists and 78 points, leading all OHL rookies in scoring during the
2005–06 season. The 19-year-old was the second runner-up for the
Emms Family Award, as OHL Rookie of the Year, behind
Logan Couture of the
Ottawa 67's and 15-year-old winner
John Tavares of the
Oshawa Generals. Sergei was instrumental in the London Knights' 2006 playoff run, which saw them lose to the
Peterborough Petes in the OHL final. In his first ever OHL playoff game against the
Sault Ste. Marie Greyhounds, Sergei had six points, a goal and five assists, in a 6–1 London win. In the semi-finals, Kostitsyn scored the series-clinching goal against the
Guelph Storm, a
power play goal in the first
overtime of game five. The Knights named him the playoff performer of the year, finishing the post-season with 37 points in 19 games. Joining the Canadiens'
2006–07 training camp, Kostitsyn was returned to London for a second OHL season. He was placed on a line with young superstars
Patrick Kane and
Sam Gagner and was named an
alternate captain. Kostitsyn finished third in OHL and CHL scoring behind teammate Patrick Kane and Oshawa's John Tavares, tallying 40 goals and 131 points in only 59 games. His 91 assists led the CHL.
Montreal Canadiens On 2 May 2007, Sergei Kostitsyn signed an amateur tryout contract with the Canadiens' AHL team, the
Hamilton Bulldogs. However, after not being inserted in the lineup, he returned home to see his family. On 25 May, Kostitsyn signed with the Canadiens to a 3-year, entry-level contract. Sergei recorded his first career NHL point, an assist, in the next game, a 4–1 win against the
Toronto Maple Leafs on 15 December. Five days later, in his fourth game on 20 December, Sergei scored his first career NHL goal, a power play marker in a 5–2 win against the
Washington Capitals. He finished his rookie season with 27 points in 51 games and added eight points in 12 playoff games. The following season, Kostitsyn was reassigned to Hamilton on 19 February 2009. He was called back up a little over a month later on 22 March. Prior to the 2009–10 season, Kostitsyn was cut from the lineup and assigned to Hamilton. On 30 September, he announced that he would not report to Hamilton and even asked to be traded. He was then suspended by the team. A few days later, Kostitsyn agreed to report to the Bulldogs in time for the start of the
2009–10 season. After four points in the first five games of the season, however, he left the team on 21 October and was consequently suspended a second time by the Canadiens. He finally decided to report once again to the Hamilton Bulldogs and after recording 13 points in 16 games with the Bulldogs, he was recalled by the Canadiens. On 7 May, Sergei was effectively cut from the Canadiens when Jacques Martin told the player to stay off the ice for the morning practice.
Nashville Predators On 29 June 2010, Kostitsyn was sent to the
Nashville Predators for goaltender
Dan Ellis and forward
Dustin Boyd in a trade involving future considerations. On 6 July, Kostitsyn signed a one-year deal with the Predators worth $550,000 that ran through the 2010–11 season. In the
2011–12 season, his second with the Predators, Kostitsyn scored his first career
hat-trick on 1 January 2012. On 4 July 2013, Kostitsyn was placed on waivers for the condition of a mutual termination of his contract with the Predators. On 6 July 2013, he signed a three-year contract to return to
Avangard Omsk of the
Kontinental Hockey League (KHL), his club during the
2012 NHL lockout.
KHL In June 2014, Avangard Omsk traded Kostitsyn to
Ak Bars Kazan in exchange for
Konstantin Barulin. In the 2015–16 season, he played for
Torpedo Nizhny Novgorod before joining
Dinamo Minsk for the 2016–17 season and then returned to Torpedo for the 2017–18 season. On 3 May 2018, Kostitsyn signed a two-year contract as a free agent to return to his native Belarus, for a second stint with Dinamo Minsk of the KHL. ==International play==