Manchester United forward Zlatan Ibrahimovic scored a rather fortuitous opener as his free-kick deflected in off the wallRed Devils playmaker Juan Mata puts his arms in the air in celebration after United took the lead at Old Trafford on 15 minutesThe Swede struck his free-kick low and managed to catch the St Etienne wall out as it deflected and trickled into the netEtienne goalkeeper Stephane Ruffier was left footed by the deflection and could not re-position body quick enough to saveRuffier watches on helpless as St Etienne captain Loic Perrin makes a desperate but failed attempt to stop the ball going inAnder Herrera jumps on the goalscorer to celebrate as Ibrahimovic prepares to embrace Daley Blind after scoring for UnitedThe rest of the United starting XI to gather in celebration after gaining the advantage against the French side early onIbrahimovic's face is full of concentration as he taps home an easy second to double the advantage for Manchester UnitedThe 35-year-old, full of confidence and swagger, holds his arms out on the spot after scoring in front of the United faithfulIbrahimovic expertly scores from the penalty spot to net his first hat-trick for Manchester United on Thursday eveningPogba and Ibrahimovic watch on as the Frenchman's header beat Ruffier but smacked the crossbar and bounced back outThe Pogba brothers - Florentin (left) and Paul -take to the field as the two sides prepared for the usual pre-match handshakesFrenchman Anthony Martial bends a right-footed shot at the St Etienne goal as Kevin Malcuit fails to block the effortSt Etienne goalkeeper Stephane Ruffier makes a brave, sprawling save to deny Juan Mata who stretches but is denied a goalPaul Pogba covers his mouth as he speaks with his brother Florentin, a defender, as the siblings did battle at Old TraffordMidfielder Marouane Fellaini, subbed at half-time, is dispossessed by former Cardiff defender Kevin Theophile-CatherineFellaini was again attracting attention from another Etienne defender as captain Loic Perrin attempts to grapple the BelgianManchester United's Ander Herrera releases the ball under pressure from St Etienne's Romain Hammouma in midfieldCentre back Eric Bailly plays a forward ball for the hosts with his left foot beyond St Etienne forward Kevin Monnet-PaquetPogba, signed for £89million last summer, battles Jordan Veretout, on loan at St Etienne from Championship Aston VillaManchester United's Mata looks to skilfully weave his way past the St Etienne defence during Thursday's important first legHenri Saivet, on loan from Newcastle after joining the Magpies in January 2016, attempts to beat Blind down the leftUnited boss Jose Mourinho gestures on the Old Trafford touchline as St Etienne manager Christophe Galtier watches on