Former PSG and Sevilla boss Emery joined the Gunners in May 2018 but the Spaniard was sacked after just one-and-a-half seasons in the Premier League.
Before his axing, Arsenal had not won in seven matches and suffered their worst run without a victory since 1992.
The Gunners have only won three matches under former Arsenal midfielder Arteta but Ozil and Lacazette believe the team have united since Pep Guardiola’s former assistant took over.
Ozil, talking at Arsenal’s Dubai warm-weather training camp, said: ‘As a team, we are much happier and everyone wants to give everything for this club.
‘Especially tactically we improve a lot and I hope in the future we will be more successful.’
Lacazette added: ‘We are more together now.
‘The way we think as well on the pitch and outside the pitch. Tactically we are better and we’re going to see a big improvement in the next few…