Petr Cech may take weeks or months to get over leaving Chelsea but can be a huge asset to Arsenal, according to former keeper Jens Lehmann.
Jens Lehmann has urged Petr Cech to sever his emotional ties to Chelsea after moving across London to join Arsenal.
Cech ended 11 decorated seasons at Stamford Bridge by joining Arsenal last month, citing a desire for regular first-team football having being usurped by Thibaut Courtois.
Former Germany international Lehmann played in goal when Arsenal famously won the 2003-04 Premier League title without losing a game and he said that making the switch between major rivals could be troubling for Cech.