Pep Guardiola admitted he was impressed as Bundesliga leader Bayern Munich inflicted a record 8-0 rout on Hamburg to warm up for facing Shakhtar Donetsk in the Champions League.

It was Hamburg's heaviest Bundesliga defeat while Bayern enjoyed its biggest league win since romping to a 9-0 win over Kickers Offenbach back in 1984.

Stars Arjen Robben, Thomas Mueller and Mario Goetze all netted twice as Bayern ran riot at Munich's Allianz Arena ahead of Tuesday's last-16, first-leg clash against Shakhtar in Lviv.

Despite previously insisting Bayern would have "problems defending the Bundesliga title and no chance of winning the Champions League" unless it improved on recent performances, Guardiola was happy.

"We played well. Our build-up play was quicker than last time and our usual game is back. Now we're focused on the Champions League," said Bayern's Spanish coach after another record win over Hamburg.

Guardiola left defensive midfielder Xabi Alonso out of his starting lineup but said the Spain star should be fit for Donetsk.

"Xabi Alonso had a bit of a problem with his leg and we didn't want to take a risk," he said.

Bayern has developed a habit of destroying Hamburg in Munich and peppered the visitor's goal with 25 shots with just seven in reply.

Just over two years after its 9-2 drubbing in Munich, Hamburg was again made to suffer having also been beaten 3-1, 5-0 and 6-0 on its past four visits to the Bavarian capital.

Germany star Mueller particulary caught the eye as he converted a penalty for Bayern's first goal before setting up three more.

"When we play like that, of course it's fun," said Bayern captain Bastian Schweinsteiger, who reveled in his defensive midfield role.

"We worked well, kept things simple and moved well, plus there was a lot of talking on the pitch, which makes life easier.

"Our buildup play was much better than in previous weeks and we were better going forward."

Bayern's Poland striker, Robert Lewandowski, who scored its sixth goal, said the 2013 Champions League winner can expect a tougher time in Lviv.

"Eight-0 and a super performance. It's always good for us when we can score a lot of goals," said the striker, who has eight league goals this season and set up Franck Ribery for Bayern's seventh.

"Of course, Tuesday will be a different game but we are prepared. I am delighted that we played so well."

Eight points clear

Bayern stays eight points clear after racing to a 2-0 lead with 23 minutes gone as Mueller slotted a penalty, then his Germany teammate, Goetze, added a second.

Robben danced through Hamburg's defense, then curled home a 36th-minute goal to claim the third.

Hamburg's luck had clearly deserted it as replays showed Goetze had briefly touched the ball at the start of the move.

Robben grabbed his second after 47 minutes as the game became little more than a shooting session as the hosts ran riot.

Mueller curled home a superb shot after a run by his captain, Bastian Schweinsteiger, on 55 minutes.

Lewandowski got on the scoresheet to make it 6-0 barely a minute later when Robben's pass found Mueller, who had all the time in the world to roll his pass to the Polish striker's feet.

France winger Ribery came off the bench to add to Jaroslav Drobny's misery in the Hamburg goal on 69 minutes before Goetze claimed his side's eighth two minute from time.