2005-06: Brought up in the Lukko organization of his hometown Rauma, Atte Engren didn't get an international career going until late in his U18 year. He went on a hot streak in the spring season and playoffs of the Finnish Jr A league, making the U18 WC tournament as a backup. He bowed to receive a silver medal, having played just half a minute in the tournament. He was passed over in the NHL draft.
2006-07: Engren enjoyed a solid season with Lukko Jr A. As U19, he appeared in just two international games, posting solid numbers against Belarus. Still, it was this year that the Predators had scouted Engren sufficiently to pick him in the seventh round of the 2007 NHL Draft.
2007-08: Engren made his SM-Liiga debut in late December, starting one game for Lukko Rauma, and appeared in one game for Hokki in Mesis. He skated in 31 games for Lukko's junior team in the U20 SM-Liiga. Engren recorded 36 saves and allowed 3 goals in a 4-2 loss to Tappara for Lukko and allowed 4 goals in fifteen minutes in his stint with Hokki. In 31 games for Lukko U20 he was 14-13 with 1 shutout and had a 2.98 goals against and .907 save percentage.
2008-09: With limited opportunities in Rauma, Engren moved to TPS in Turku hoping to play in the SM-Liiga. However, Czech goalie Alexander Salak played in 52 of 58 games as the TPS starter. Engren appeared in six games as Salak's backup and played a handful of games on loan to Kiekko-Vantaa in Mestis (second division). He was 1-4-1 playing for TPS, which finished tenth in the 14-team SM-Liiga. Engren had a 3.22 goals against and .833 save percentage. He was 3-2 with Kiekko-Vantaa and had a 2.05 goals against and .920 save percentage. Engren was 3-1 with a 2.75 goals against and .909 save percentage in four games with the TPS U20 team.
2009-10: Engren and American David Leggio split the goaltending duties for TPS Turku; taking over for Salak after Salak signed with the Panthers. Engren was 15-13-1 with 2 shutouts in 35 regular season games with a 2.63 goals against and .921 save percentage. TPS, after finishing sixth during the regular season, captured the Kanada Cup playoff championship. Engren appeared in 8 of 15 games in the playoffs and was 7-1 with 1 shutout; posting a 1.82 goals against and .936 save percentage. Engren signed a two-year entry-level contract with the Predators in May 2010.
2010-11: Engren made his pro debut in North America – skating in four games with the AHL Milwaukee Admirals at the end of they year after appearing in a career-high 51 games for TPS Turku during the SM-Liiga season. He was 2-2 with Milwaukee with a 2.43 goals against and .914 save percentage. The Admirals finished first in the West Division and advanced to the second round but Engren did not see any playoff action. He was a workhorse for TPS Turku, which slipped to 13th in the 14-team SM-Liiga, with many of the key players from the championship moved on to greener pastures. Engren finished the season 10-25-13 with a 2.82 goals against and .918 save percentage.
2011-12: Engren appeared in 23 games for Nashville's AHL affiliate Milwaukee as a backup to starter Jeremy Smith in his first full season in North America. After getting off to a slow start, he played better as the season went on – finishing 8-14, with three of the losses coming in overtime. He had a 2.45 goals against and .911 save percentage. The Admirals finished second in the North Division. Engren did not see any action in the three-game playoff series with Abbotsford. In May 2012 he signed a contract to play for TPS Turku in Finland in 2012-13.
Engren is a good athletic goalie that is technically sound and has good cross crease lateral speed. The smart goaltender has a solid understanding of the game and reads the play in front of him very well. He plays the new hybrid butterfly style, is very consistent and has composure under pressure. The good sized netminder plays at the top of his crease, covers his angle well and has good rebound control. Engren needs to improve his stickwork and learn to stay more upright when dropping into his butterfly to cover the top of his net.
Engren was given a qualifying offer by the Predators this summer but decided to play in Europe instead and signed with TPS (SM-liiga) in Finland. His rights are still retained by Nashville but the talented goalie might no longer be part of the Predators' plans going forward.