Chelsea beef up attack with Olivier Giroud signing; Michy Batshuayi joins Dortmund

London: Chelsea have strengthened their forward line with the signing of French striker Olivier Giroud from Arsenal on an 18-month contract, the Premier League clubs said on Wednesday. Giroud arrives at Stamford Bridge after struggling to cement a place in the Arsenal starting lineup this season, with manager Arsene Wenger preferring to start Frenchman Alexandre Lacazette as a lone striker. Giroud provides Chelsea boss Antonio Conte with options up front and eases the pressure on their record signing Alvaro Morata, who has gone off the boil after a good start to life in London. "Chelsea is one of the biggest teams in the Premier League," the 31-year-old Giroud said in a statement. "They have won maybe the most trophies in the last six or seven years. It's a massive club and I am proud to sign for Chelsea, and I'm looking forward to playing." Giroud has made 16 league appearances this season, 15 as a substitute. He joined Arsenal from French side Montpellier in 2012 and his goal tally has hit double figures in each of the last five seasons. Chelsea were linked with several strikers who could offer an aerial threat, including AS Roma's Edin Dzeko, Peter Crouch of Stoke City and Tottenham Hotspur's Fernando Llorente, before landing Giroud following Pierre-Emerick Aubameyang's arrival at Arsenal from Borussia Dortmund. Chelsea striker Michy Batshuayi has moved to Borussia Dortmund on loan until the end of the season, the Premier League club announced.