Archer is yet to score for Saints, having missed from the spot in defeat to Manchester United a fortnight ago.
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Martin told the Daily Echo: "I think Cam needs to get his first (Premier League) goal. He had chances.
"He was such a threat. When he gets that first goal, I think he will really take off. We need to keep doing what we are doing.
"We just need to keep getting better and better and it will come."