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Ten things we learned this week presents a ten-point guide to this week's UEFA Champions League action.

By Jon Fisher presents a ten-point guide to this week's UEFA Champions League action.

1) Loko thrive in the cold
The temperature at kick-off in Moscow was -7C on Tuesday - ideal conditions for FC Lokomotiv Moskva to gain the advantage in their tie with AS Monaco FC. The Muscovites had already defeated FC Internazionale at their Lokomotiv stadium and Monaco were the latest high-profile team to return home empty handed after a 2-1 defeat.

2) Even the greats have off days
He may have been the 2002 FIFA World Cup's top goalkeeper, but FC Bayern München's Oliver Kahn has his frailties. He allowed a Roberto Carlos free-kick to squirm under his body to hand Real Madrid CF a barely-deserved 1-1 draw from their trip to the Olympiastadion.

3) Arsenal can win in Spain
Arsenal FC's away form in the Champions League was expected to be their achilles heel. However Tuesday night's 3-2 victory at RC Celta de Vigo was their first in seven attempts on Spanish soil, and will give them confidence for their remaining away games in Europe.

4) Shevchenko is not perfect
Defending champions AC Milan were held to a goalless draw at AC Sparta Praha on Tuesday but it was a result that would have been very different had Andriy Shevchenko taken his scoring boots to the Czech capital. The Ukrainian international was guilty of two glaring misses.

5) Makaay loves Spanish defences
Roy Makaay collected the golden boot last season after scoring 29 league goals for RC Deportivo La Coruña. Spanish defenders were relieved when he moved to Bayern but Makaay showed he still loves punishing Spanish defences with a header after 75 minutes to give the German champions the lead against Madrid.

6) Own goals win games
Olympique Lyonnais and Chelsea FC both profited from unfortunate own goals in their ties with Real Sociedad de Fútbol and VfB Stuttgart respectively. Gabriel Schurrer put past his own goalkeeper to hand Lyon a 1-0 win at the Anoeta while Fernando Meira slid the ball into his own net to give Claudio Ranieri's men the edge in Germany.

7) McCarthy is the man for Porto
South African international Benni McCarthy was the hero of FC Porto's 2-1 win against Manchester United FC. He cancelled out Quinton Fortune's opener with a neat volley and then gave José Mourinho's men the advantage with a magnificent header.

8) Del Piero has his flaws
Alessandro Del Piero, the golden boy of Juventus FC, spurned two great chances as the Bianconeri slumped to a disappointing 1-0 defeat at Deportivo on Wednesday night. Alberto Luque scored the only goal after 37 minutes to give the Galicians the edge.

9) Ranieri is clinging on
Despite constant speculation linking every top-name coach across Europe with a move to Stamford Bridge, current Chelsea boss Claudio Ranieri shows no sign of relinquishing his hold on the post. Wednesday's win at Stuttgart means the Blues now have one foot in the last eight.

10) Do not underestimate the French
Following the first-leg ties, there is now a real chance that two Ligue 1 sides will make it through to the last eight. Lyon gained a 1-0 advantage from their trip to Real while Monaco are far from out of their meeting with Lokomotiv.