Sportswear giants Adidas must still be struggling to fathom Petr Cech's summer move to Arsenal, after bizarrely sending his latest pair of personalised gloves to Chelsea's training complex.
The 33-year-old goalkeeper was surprisingly allowed to join their rivals when owner Roman Abramovich felt that, as a gesture of goodwill following 11 successful years at Stamford Bridge, Cech should be allowed to choose his next club.
However, Adidas sent his gloves to Chelsea's Cobham training ground instead of Arsenal's Colney base. With the two sides set to meet on Sunday afternoon, it must have been tempting for staff to say nothing. But honest employees found it funny and soon corrected the mistake.
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"There were a few smiles and mischievous remarks when Petr's gloves turned up here," a Chelsea source told the Telegraph. "But we made sure they got back to him as soon as possible."
They may regret that come Monday, as Cech has been one of the season's best signings. Since the £10 million transfer, he has kept 10 Premier League clean sheets and is aiming to win his fifth league title - the first man since Eric Cantona to win it in successive seasons with different clubs.
Arsene Wenger has given Arsenal fans a boost ahead of the London derby, with Mesut Ozil "certainly" available for selection and Alexis Sanchez set to return after a hamstring injury. "For Alexis, the next few days will be decisive but I think this time he will make it.
"I am cautious with him because we cannot afford a setback with him," Wenger added in his press conference. "A setback would mean a very long period out so we don't want to take this gamble. The signs he has shown in training this week are positive."
Arsenal go into the clash top of the league, edging ahead of Leicester on goal difference. Chelsea, meanwhile, have had a nightmare season and find themselves down in 14th place.
Chelsea and Arsenal fans - which way do you see Sunday's derby going? Let us know by posting a comment below.