Manchester United boss Erik ten Hag is unhappy with the lack of two-sided players in his squad.
Upon his arrival at Carrington, ten Hag noted a shortage of left-footed players, and countered this by signing Tyrell Malacia, Lisandro Martinez and Antony.
The Manchester Evening News says the 52-year-old has set up specific drills after main sessions to strengthen the weaker foot of existing United players.
Training sessions have got more intense with new arrivals including Antony and Casemiro. It has also increased competition for places, with Scott McTominay stepping up to keep £70m signing Casemiro out of the side.
Sources believe United's senior hierarchy have backed ten Hag's ideas at Old Trafford, with his disciplined management style balanced by his personable nature.