Jordan Henderson's first goal for Brentford was cancelled out by Dominic Calvert-Lewin as the points were shared at the Gtech.
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"It was always going to be a difficult game," said Andrews afterwards.
"We were facing a team that came up, respected the league in terms of how they recruited - physically and athletically - the results they had in recent weeks against Chelsea and Liverpool.
"We faced them at a time when they were probably at the peak of their season, and we didn't hit the heights in terms of what we have done, particularly at home.
"It's frustrating in certain ways but, equally, it's a point that's probably a fair result, and we move on."