Welbeck has started all 5 Premier League games for Arsenal this season.
Lacazette has completed the full 90 minutes on just one occasion in the PL this season.
The midfielder sat out of the Gunners' 3-1 drubbing of Cologne in the Europa League.
Fabregas, 30, joined Chelsea from Barcelona in 2014.
Gunners have not won at Stamford Bridge since 2011.
Bakayoko signed for Chelsea in the summer.
Arsenal face Chelsea next and Bellerin has warned it will not be an easy task against the Blues.
Chelsea vs Arsenal, Premier League 2017/18: Where to watch live, preview, betting odds and possible XI
Chelsea have won eight of their last 11 Premier League meetings against Arsenal (D2, L1).
Giroiud made only 11 starts for Arsenal last season in the league
Arsene Wenger confident Mesut Ozil and Aaron Ramsey will be available for Arsenal's clash against Chelsea
Wenger unsure if Alexis Sanchez will start at Chelsea having played the entire 90 minutes against Cologne on Thursday (14 September).
The champions have had 48 hours longer to rest after their pair's European exploits.
Kolasinac scored Arsenal's opener after coming on in the second half.
Arsene Wenger demands Uefa investigation into behaviour of 'clever' Cologne fans in Europa League tie
Arsenal boss said police decision to play the game after 60 minute delay was a "risk".
Arsenal's hopes of finally signing the France international over after inclusion of exit clause.
Wenger remains hopeful that Arsenal can agree a new deal with Ozil.
Both players were sidelined over the weekend but returned to training on Monday.
Mesut Ozil and Aaron Ramsey among those who will sit out the Europa League opener at The Emirates Stadium.
Reports in Germany suggest Ozil will not sign a new deal and will join Alexis Sanchez out of the Emirates in the summer.
The Spain international last featured for Arsene Wenger's side in October 2016.
Wilshere was linked with a move away from Arsenal this summer.
Arsenal failed to make the top four for the first time in 21 years during the 2016/17 season.
Koscielny is serving a one-game ban after picking up a red card during Arsenal's loss to Bayern last season.
Arsenal were ready to pay a Premier League record £91m to sign Lemar this summer.
Wenger has won three titles at Arsenal and seven FA Cups.
Jack Wilshere should have rejected Bournemouth and told Wenger to sell him, says Arsenal legend Tony Adams
Wilshere did not leave Arsenal during the transfer window and has just one year left on his contract.
The Chile international almost left the club for Man City on transfer deadline day.
Wenger was successful in retaining Alexis Sanchez at Arsenal.
Sanchez and Mustafi were both linked with a move out of the Emirates.
Nelson has been backed to replace Alex Oxlade-Chamberlain.
Nelson has already scored five gpals in the PL2 this season.