The former Queens Park Rangers manager has his concerns over whether the Premier League champions would be able to cope without main man Diego Costa.
Costa has struggled with a hamstring problem since his final season at Atletico Madrid and appears to be struggling for fitness heading into the new campaign.
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Redknapp has his concerns that Loic Remy and Radamel Falcao may not be able to shoulder the goalscoring burden should Costa suffer a relapse of his problem.
However the 68-year-old believes that if anyone can bring Falcao back to his best, it is indeed the Chelsea manager.
Writing on his Kicca page, Redknapp said: "If Costa does pick up injuries, and it seems his hamstring isn’t great at the moment, one of Remy and Falcao has got to carry the baton and do the job and whether they can is the question mark.
"Maybe Falcao can do the job, Jose’s placed his faith in him. Jose can lift people and improve people and if he can get the best out of him maybe they’ll be ok."
Costa missed the Community Shield defeat to Arsenal, and Mourinho has also said he does not know whether the striker will be fit for the opening day game against Swansea City.
Remy started the match at Wembley and was replaced by Falcao just after half-time. Neither forward threatened to beat former Chelsea keeper Petr Cech in the Arsenal net, however the Columbian forward offered more of a physical threat for his side compared to his French team-mate.
Former Atletico forward Costa struggled with his hamstring problems during the last campaign and was limited to 26 league appearances, but his 20 goals were vital in helping the London club win their first title in five years.
Mourinho will be hoping the Spain international can continue his impressive league goalscoring record heading into the new season, even if his appearances are limited.
Following Falcao's disastrous season at Manchester United their are doubts as to whether the Columbian can ever rediscover the form that made him one of the most feared strikers in world football. Remy also has his own injury problems.
What could be slightly worrying for Chelsea fans heading into the new campaign is the lack of new additions at Chelsea this summer. Looking at previous title defences, the most successful sides are ones that improve on their first team, just look at Manchester City's two previous attempts to defend their title.