Manager Carlo Ancelotti has described Poland striker Robert Lewandowski as "extremely dangerous" to Real Madrid's plans of booking their Champions League semi-final berth at Borussia Dortmund on Tuesday.

Real are on the verge of a fourth consecutive semi-final appearance after beating Borussia 3-0 in the quarter-final, first-leg in Madrid last Wednesday when Dortmund's Lewandowski was suspended.

The 25-year-old returns to lead Dortmund's attack at Borussia's Westfalenstadion in the quarter-final return leg with hosts needing a near-miracle to reach the semi-finals by beating Real at least 4-0 in Germany.

But no Real fan needs reminding of the Poland star's four goals he scored against Madrid in last year's semi-final first leg as the Spaniards eventually bowed out.

"Robert Lewandowski is a fantastic player and extremely dangerous," Ancelotti told Sky Sports.

"He is the key player for the type of football Borussia Dortmund play.

"Dortmund will try everything to turn around the result from the first leg.

"It will be an extremely intensive game and we need a good day."

Ancelotti is waiting on the fitness of Real's world player of the year Cristiano Ronaldo, who broke off training after only 20 minutes on Monday and missed Saturday's 4-0 win at Real Sociedad with a knee injury.