Following defeats against Everton and Manchester City in a week described as 'horrible' by Arsene Wenger, Gabriel has called on the squad to rally and "keep each other in check".
Speaking after the 2-1 defeat at Etihad Stadium, the Brazilian defender urged period of reflection before focusing on the upcoming festive fixtures.
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"We had two away games to gain six points, and we ended up not achieving that," Gabriel said. "We lost both games on reversals [losing from a winning position], with basic mistakes.
"This cannot happen. I think each of us needs to reflect and try to keep each other in check. We must know how to demand from each other, and how to respect each other.
"We were coming from a good string of games, and met Everton feeling totally confident that we would win the match. We did start out winning, but ended up suffering a comeback - once again.
"We conceded two goals, which is something that just can’t happen to a team as big as ours. And it wasn’t different on Sunday.
"We started out winning and ended up losing on a comeback. I think now is a good time for the team to stop and think about the mistakes we’ve made in these two games to try and improve on that."
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