Chelsea legend Frank Lampard has challenge the Blues attacker Eden Hazard to reach the height of Cristiano Ronaldo and Lionel Messi.Hazard replaced Pedro in the 58th minute in the Champions League game between Chelsea and Qarabag in the Stamford Bridge on Tuesday, Chelsea won the game with a 6-0 score line.Lampard, appearing as a pundit on BT Sport was asked whether Chelsea had enough depth on their side to compete in the Champions League and the Premier League.RELATED: Eden Hazard is not back to his best yet - Antonio ConteHe said: 'I think they do. They're the unknowns. We talk about [Alvaro] Morata being their main man. He's the form man and he needs to stay injury-free, especially for sure. 'They are very well drilled. I do fancy their chances of going far because they are so well drilled and can defend, which we kept talking about before.'The 39-year-old then focused on Hazard - a player he feels is one of the best in the world.A great plus today with [Eden] Hazard who came on at the weekend and came on again today,' he said. 'I feel that he'll be involved at the weekend and going forward. He's the magic in the Chelsea team. 'If Eden Hazard's on his game he's got the magic that we talk about with the Messi's and Ronaldo's - he can get towards that level.'Chelsea will return to action this weekend against the FA CAup and Community Shield winner Arsenal at the Stamford Bridge on Sunday.