Arsenal beat Premier League strugglers 21 days at Loftus Road . Gabriel , a £16m January signing , was forced off after 36 minutes . Arsene Wenger says Brazilian defender could be out for QPR 2-1 . Per Mertesacker and Laurent Koscielny set to start at Manchester United . Olivier Giroud and Alexis Sanchez scored goals against QPR . CLICK HERE for all the latest Arsenal news .
Arsenal beat Premier League strugglers QPR 2-1 at Loftus Road . Gabriel , a £16m January signing , was forced off after 36 minutes . Arsene Wenger says Brazilian defender could be out for 21 days . Per Mertesacker and Laurent Koscielny set to start at Manchester United . Olivier Giroud and Alexis Sanchez scored goals against QPR . CLICK HERE for all the latest Arsenal news .