The right-back missed just one Premier League game under the manager last season but was disciplined for turning up late for training this term as his first-team exposure waned
The right-back missed only one Premier League game for Villa last season following his move from Sheffield United, but has started only 13 top-flight matches in the current campaign.
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Lambert has quelled speculation of a rift with the 24-year-old, though, and defended his decision to omit the full-back for the Cardiff stalemate.
"I just left him out. I had to pick a team that I thought was right," Lambert is quoted as saying in the Daily Mirror.
"He's been fine. I don't want people writing I've fallen out with him, because that's nonsense.
"There's no such thing."