Kieran Gibbs has hailed the impact of new Arsenal teammate Alexis Sanchez in training.
Alexis is expected to start for Arsenal today against Manchester City in the Community Shield.
"Alexis is like an animal in training," said Gibbs.
"He doesn't stop running. That is what we need. We can't just sign a superstar and say, "Ok we're going to win everything'."
Training against him, says Gibbs, is "not the best day you're going to have; he's a top player who will bring something extra".
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