West Ham attacker Michail Antonio admitted frustration after defeat to Southampton on Sunday.
Antonio, like his teammates, was bitterly disappointed to lose 3-2 to Southampton on Boxing Day – particularly after twice coming from behind to level at London Stadium.
He told the club's website: "We're very disappointed to lose like that.
"We came out for the second half, got the goal back and thought we could get something from it, but to concede three goals was disappointing and it's something we don't really do.
"We're disappointed with how it's gone, but we've got to dig deep. We've got another game in two days so we need to pick ourselves up and go again."
He continued: "We've got to think positively.
"Over the last five weeks we've been a bit stale in our performances and I think that could be down to mental fatigue more than physical. We're not used to playing so many games but we can't make excuses for it. We're professional footballers and we have to keep going.
"We're not playing badly, we're just not scoring goals basically. We'll go again – we got two today, I've scored a goal, Saïd [Benrahma] too, and hopefully that can get us on a nice little run to get ourselves back up the league."
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