Chelsea manager Thomas Tuchel has now defeated Pep Guardiola for the first time in his career.
Nigerians will be hoping the former FIFA U-20 highest goalscorer replicates his fine form for the Super Eagles.
Sunday’s defeat further reduces the chances of Liverpool retaining the English Premiere League title this season.
Solskjaer said any talk of Manchester United being in the title race was misplaced.
Extra time loomed when Ihenacho was picked out at the far post from a corner, and he headed home.
German manager Tuchel took over from the sacked former Blues midfielder Frank Lampard on Tuesday after signing an 18-month contract.
Lampard admitted he is “worried about the slump.”
Arsenal have lost five of their last seven Premier League games and lie in 15th place.
