Apart from his controversial tactical decisions, the Swiss tactician failed to instruct his players to shrug off their repeated mistakes.
He has until now failed to detect their deficiencies as Zamalek only claimed four points out of possible nine.
Below are some problems which Decastel has to address if the Cairo giants are to become genuine title contenders.
* Like last season, Zamalek defenders are easily out-jumped by their opponents in set-pieces. This was clear in their game against Petrojet when Walid Soliman headed in the winner with few minutes remaining.
* Central defender Mahmoud Fathallah does not really trouble strikers. He allowed Petrojet's Al-Sayed Hamdi to control the ball with his back to goal, turn him inside the area and hit a low shot into the bottom corner.
*Hani Saied sometimes forgets that he is a sweeper. Where was he when Contractors midfielder Alaa Kamal found himself unmarked to fire home from eight yards out? Saied's positioning was very bad.
*Lively right-back Hazem Emam should realize that opponents have become very familiar with his tricks. He is speedy and skilful, so he can try other methods of bamboozling challengers.
*Left-back Sabri Rahil notably improved in terms of attacking duties, but his crosses need to be more accurate.
*Midfielder Ahmed Al-Merghani should work on improving his tackles. He hardly steals the ball without fouling his opponent.
*Playmaker Shikabala should top his useless back-heel passes, which often end in the other team making a dangerous counter attack. Show play does him no favors.
*Mido should be aware that overreacting will further tarnish his already-blemished reputation. Concentration will be key for him to make a good impact this season.
*Combative striker Sayed Mosaad should start Zamalek's upcoming games instead of the ineffective Ahmed Gaafar.
*Where is Ghanaian promising midfielder Ibrahim Ayew?