Arsenal have lost their last five away Premier League games versus Chelsea, their joint-longest away losing run in the competition against a single opponent (also 5 in a row vs Man Utd between 2009-2013).
Chelsea are massive 4/5 favourites on Sunday.
Things were not as easy for Arsenal, who were trailing 1-0 at half time against Koln on Thursday night.
According to latest statistics, almost 2,000 football-related arrests were made in the 2015-16 season at matches in England and Wales, a 1% increase on the previous and the first rise for three years.
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Arsene Wenger's side have begun turning things around by beating both Bournemouth and Cologne but Merson thinks Arsenal will capitulate like they did against Liverpool if Chelsea score first. If Chelsea go a goal up, you know Arsenal will capitulate.
Wenger introduced the back three last season to try to provoke a bit more steel and resilience at a time when his team were suffering from an outbreak of serious defensive flakiness, and it was a helpful tool to improve matters for a few weeks and set them up to win the FA Cup by defeating Manchester City in the semi-final and Chelsea in the final.
The Gunners' last win at Stamford Bridge came nearly six years ago.
The win takes the Gunners top of their group table, as Group H's other game, Red Star Belgrade against BATE Borisov ended 1-1. Defeat on Sunday would be their sixth consecutive defeat in such games.
Captain Gary Cahill will return to the starting line-up having served a three-match domestic suspension.
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Democrat Sherrod Brown criticized the president's decision to end the program and said he supports the DREAM Act. House Speaker Paul Ryan insisted President Trump had not made a deal with Democrats on DACA .
"They have done great to turn things around after a hard start".
Fellow midfielder Jack Wilshire could also be involved after making his first appearance for the club since August 2016 in the 3-0 victory.
Elsewhere, Calum Chambers has returned to full training, while Theo Walcott is expected to be fit.
That means Arsenal's injury list is down to just two: long-term absentee Santi Cazorla, and Francis Coquelin who is out for around a month.
Real Madrid defender Marcelo signs new five-year deal
If Real does manage to get him sign a deal, then United could go in for Bale, whom they are chasing for quite sometime. It is a real dream come true and both my family and I are really pleased. "I have goals that I want to reach".