Roberto Di Matteo impressed with Santi Cazorla

Chelsea manager Roberto Di Matteo has admitted that he has been impressed with Santi Cazorla's impact at Arsenal ahead of the two sides' encounter this weekend.

The Spanish midfielder, who joined the Gunners from Malaga in August, is expected to line up at the Emirates Stadium on Saturday following a string of dazzling performances for his new team this season.

"There's always a bit of concern when players come in from another league. It can take time," Di Matteo told reporters. "We had the same experience with [Juan] Mata last season, who really settled in very quickly.

"[Cazorla is] a very exciting player to watch, who's made an impact in Arsenal's team. He's been a bit of a highlight so far."

Both teams go into the match on Saturday with unbeaten records in the Premier League this season.