Chelsea are looking forward to a reunion with Michael Ballack in the UEFA Champions League.
Villas-Boas will not underestimate Valencia, Leverkusen and Genk
Chelsea are looking forward to a reunion with Michael Ballack in the UEFA Champions League, according to the club's communications director, Steve Atkins.
The 2008 finalists were drawn in Group E along with Valencia, Bayer Leverkusen and Belgian club Genk.
That means new signing Juan Mata will be facing former club Valencia after completing his move to Andre Villas-Boas' Chelsea.
The draw will also see Ballack, who left Stamford Bridge in 2010 after four years at Stamford Bridge, face his ex-employers.
Atkins said: "Every draw throws up challenges and this is no different, and I have spoken to Andre and he certainly feels that too.
"Valencia is a formidable team and a very difficult place to go with their support - Juan Mata will be returning there a little bit more quickly than he thought!
"Bayer Leverkusen is also a difficult one and we will be delighted to meet up with Michael Ballack again, and Genk too are full of talent and should not be underestimated."