However, Jurgen Klopp, revealing details of their chat with Oxlade, admitted that the 24-year-old loved his former boss and never blamed him for his struggles.
Oxlade-Chamberlain insisted there was no prospect of complacency creeping into Liverpool's performance in the second leg.
Klopp raided Arsenal to snap up Oxlade-Chamberlain last summer, with the midfielder having rejected the chance to stay at Arsenal and continue under Wenger.
"It was an wonderful atmosphere, the best I've ever played in", said the £40 million summer acquisition from Arsenal.
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He has settled in well at Liverpool and hit a thumping shot to help the Reds thrash Manchester City 3-0 in the first leg of their Champions League quarter-final tie earlier this week.
"Since he's come to Liverpool, after a slow start, he's gathering momentum at a crucial part of the season and he's becoming a very, very important player to this Liverpool side at the moment", he explained.
Oxlade-Chamberlain believes their set up under Klopp makes them contenders to go all the way to the final in Kiev.
"If you are the away team and the crowd gets going like that [inside Anfield], it is awful", Oxlade-Chamberlain insisted.
"He [the referee] gave me a booking, but I was a bit disappointed because I hadn't conceded many fouls during the game".
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"It definitely shows why I wanted to come here and I want to keep improving".
"You don't need reminding how big a game that is going to be, especially at Goodison", Oxlade-Chamberlain added.
"At times it has gone against me because I can be hard on myself and beat myself up a bit", he said. A pattern emerged of one good game followed by three or four hugely frustrating ones, with the Ox one of several Arsenal players particularly guilty of losing possession in indefensible areas.
This was a sentiment expressed by several Arsenal supporters after Liverpool's midweek win, with many using it as an extra reason they are losing faith in manager Arsene Wenger. "You've seen teams go far in this competition doing that".
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