Arsenal announced former Paris Saint-Germain (PSG) coach Unai Emery as their new boss on Wednesday, handing him the daunting task of revitalizing a club that has slipped well behind their Premier League rivals.

The Spaniard, who won the domestic treble with PSG this season, emerged as the shock favorite to replace Arsene Wenger earlier this week after it had appeared former Arsenal captain Mikel Arteta was in line to land the job at the Emirates.

Wenger departed at the end of the season following a 22-year reign, with the club finishing sixth in the Premier League - 37 points behind champions Manchester City - and failing to qualify for the Champions League.

Arsenal will be wary of the turmoil at Manchester United after the departure of long-­serving manager Alex Ferguson in 2013, but said the choice of Emery was unanimous.

"Arsenal is known and loved throughout the world for its style of play, its commitment to young players, the fantastic ­stadium, the way the club is run," Emery, 46, told Arsenal's website.

"I'm very excited to be given the responsibility to start this important new chapter in Arsenal's history."

Chief Executive Ivan Gazidis said the decision to appoint the former Valencia and Spartak Moscow boss had been unanimous.

Emery left PSG this month after winning Ligue 1 and four domestic cups in two seasons in the French capital.

Before moving to France in 2016, Emery had a significant track record of success in Spain, winning three successive Europa League titles with Sevilla.

Arsenal have won three FA Cups in the past five seasons but have consistently failed to mount a credible title challenge since they were last crowned Premier League winners in 2004.

Wenger won three Premier Leagues and a record seven FA Cups during his time in charge, his crowning glory coming in the 2003-04 season when Arsenal won the league without losing a single game.

Defeat to Atletico Madrid in the Europa League semifinals earlier this month meant Arsenal missed out on Champions League qualification for a second consecutive season.