Olivier Giroud scored a hat-trick as Arsenal booked their place in the last 16 of the Champions League with a 3-0 win over Olympiacos.

The Frenchman opened the scoring with a header from Aaron Ramsey's cross, before he added a second shortly after the break with a neat finish from Joel Campbell's precise through-ball.

The Gunners were then awarded a penalty when Omar Elabdellaoui handled inside the box, and Giroud stepped up to convert the resulting spot kick to seal a memorable victory.

Here, Sports Mole rates the best and worst performances from the Karaiskakis Stadium.

OLYMPIACOS

Goal

Roberto: Will feel that he could have done better with the first goal, after allowing Giroud's header to creep into the bottom corner, but could have done little about the two other strikes. (5/10)

Defence

Omar Elabdellaoui: Was constantly beaten for pace down his side of the pitch and saw his misery compounded by giving away the penalty for Arsenal's third goal. (5/10)

Manuel Da Costa: Had a decent chance to score for Olympiacos early in the second half, but his header was easily saved by Cech. His defensive display was also poor and he was caught out badly for the second goal. (5/10)

Dimitrios Siovas: In the early stages of the match he looked strong in the air against Giroud, but he soon began to struggle against the Frenchman and did not pick up any of his runs for the goals. (5/10)

Arthur Masuaku: Was given a tough evening down his side of the pitch by Campbell, who had the pace to ease past him on numerous occasions. (5/10)

Midfield

Luka Milivojevic: A night to forget for the Serbian, who was overrun in the midfield and gave the ball away far too often. (5/10)

Kostas Fortounis: Almost dragged Olympiacos back into the match with a stinging effort that looked headed for the top corner until Cech stuck out a big hand to turn it over. (6/10)

Pajtim Kasami: Had a rare shot on target for the hosts with a low drive that was held by Cech, but failed to have any real impact on the match. (5/10)

Felipe Pardo: The Colombian made a good start to the game and looked a real danger when cutting inside from the flanks, but he tired badly in the second half. (6/10)

Seba: Had a decent chance to test the keeper early on with a shot he blazed over the bar, before firing another effort off target later in the first half. (6/10)

Attack

Brown Ideye: One of the Greek side's better players this evening. The Nigerian showed good promise in the opening stages with his pace and power, but faded as the game wore on. (6/10)

Substitutes

Alejandro Dominguez: Made little impact following his arrival on the pitch. (6/10)

Hernani: Struggled to inspire a comeback from his team in the closing stages. (6/10)

Alfred Finnbogason: Scored the winner against the Gunners in the last meeting between the teams, but had no chances to get on the scoresheet this time. (6/10)

ARSENAL

Goal

Petr Cech: Although the keeper was not overly troubled, he made an important save from Da Costa's header, before tipping a powerful drive from Fortounis over the bar. (8/10)

Defence

Hector Bellerin: Provided good width for Arsenal when they attacked down the right and was quick at getting back after a shaky start to the match against Ideye. (8/10)

Laurent Koscielny: Outstanding display from the Frenchman, who was back to his best after a testing month. He won everything in the air and made a number of vital blocks when his team came under pressure. (9/10)

Per Mertesacker: Another strong outing from an Arsenal defender. The German showed all of his experience and his positioning throughout the evening was exceptional. (8/10)

Nacho Monreal: Got forward well down the left and linked up neatly with the Gunners' attack. He also played a huge part in the third goal, when his shot hit Elabdellaoui's hand and resulted in a penalty being given. (8/10)

Midfield

Aaron Ramsey: The Welshman excelled back in his favoured central midfield role. He was strong in the challenge all evening, and helped Arsenal on their way by setting up the first goal for Giroud with a superb cross with his weaker left foot. (9/10)

Mathieu Flamini: Solid and dependable performance from the midfielder, who has been brought in to fill Coquelin's spot. He never backed out of a challenge all evening, and moments before the Gunners took the lead he struck the bar with a decent attempt. (8/10)

Mesut Ozil: The German may not have set up any goals this evening, but his all-round play and movement was fantastic. Olympiacos struggled to pick him up whenever he drifted into space and he was able to run the midfield throughout the match. (8/10)

Attack

Joel Campbell: Outstanding showing from the Costa Rican, who produced his best display in an Arsenal shirt. He caused the Greeks no end of problems with his pace and direct runs, and he also supplied the assist for Giroud's second goal with a perfectly weighted through-ball. (9/10)

Theo Walcott: Just like Campbell, the Englishman was a constant danger with his scorching pace. He made plenty of fine runs that were not picked up throughout the game and had a couple of good chances to add to the scoreline. (8/10)

Olivier Giroud: The Frenchman was the best player on the pitch and crowned a superb display with his first hat-trick for Arsenal. His threat in the air was evident to see from his opening goal, while his net two finishes were incredibly composed in such a hostile atmosphere. (10/10)

Substitutes

Kieran Gibbs: Brought on to shore up the midfield and helped ensure that the Gunners saw out the game. (7/10)

Alex Oxlade-Chamberlain: Although he was given little time to impress, the England international almost grabbed a fourth goal for his side with an effort that deflected wide from the edge of the box. (6/10)

Calum Chambers: Had no time to make an impact after coming on deep into stoppage time. (6/10)