Bayern Munich hosts Sevilla on Wednesday in the Champions League quarterfinals for their second leg, which Bayern leads 2-1. The first leg saw Sevilla take an early lead through Pablo Sarabia, however, an own goal from Jesus Navas and a late victor from Thiago Alcântara gave the Bavarians the advantage.
The club was knocked out of the Champions League after a poor showing in the group stages, but are still in with a shot of winning the Europa League.
"We need to be careful", Robben said.
"You always need top performances in the Champions League, and the same goes for tomorrow".
With Real Madrid thrashing Juventus 3-0 in their own stadium, Barcelona thumping Roma 4-1 thanks to a pair of unfortunate own goals, and Liverpool's 3-0 victory over Manchester City, Bayern's modest 2-1 scoreline in their first leg leaves something to be desired.
Acording to WhoScored.com, David Alaba and Arturo Vidal are both question marks with knocks. With their star forward Robert Lewandowski rested during that match he'll be hungry to improve upon his already impressive 26 goal haul this season with perhaps a few more during Wednesday's match.
Heynckes is wary of the return of midfielder Ever Banega - the "heart" of the Sevilla team - with the Argentine playmaker back from suspension.More news: Pentagon rejects United States plan to leave Syria as 'rumors'
Sevilla, though, have won just two of their last 14 away games in the competition (not including qualifiers) and Vincenzo Montella's side are priced at 14/1 (15.00), with the draw at 6/1 (7.00).
Bayern beat Hamburg and Borussia Dortmund 6-0 in their past two home league games.
"He's used all his experience at this level, he's a great man manager and all the players love him", Hargreaves said with regard to 72-year-old Heynckes. It's therefore (1.80) for both teams to score in this game.
"They did very well to win in Manchester [against United] and we know we have to perform at our best".
"We know we can score a goal or two in the second half, but we have to avoid conceding, especially in the second half".
Old Trafford stands as an example and promise of what Sevilla can do, the kind of upset they can cause.