Head coach Alan Solomons is hoping three will be Edinburgh's magic number as they look to maintain their unbeaten start in Europe.
The Gunners host London Welsh in Sunday's European Rugby Challenge Cup clash.
Having already beaten French duo B ordeaux-Begles and Lyon, the capital club top Pool 4 with eight points, Solomons now wants to make it three from three this weekend.
The South African said: "This is an important game for us in terms of remaining in contention in Europe and we need to play accordingly."
Solomons has made four changes to his line-up for Sunday's BT Murrayfield encounter.
Grayson Hart will move from the bench to start at scrum half while James Hilterbrand replaces Ross Ford at hooker after the Scotland front-rower was ruled out with a minor back injury.
A reshuffle of the back three in the pack sees Tomas Leonardi start at flanker and captain Mike Coman move to number eight as David Denton sits out the weekend action after sustaining a shoulder knock in last week's defeat to Zebre in Italy.
Three players come on to the bench following various periods of injury. Hooker Neil Cochrane - whose last appearance this season was limited to eight minutes before injury struck in the Ospreys match - lock Anton Bresler who was a casualty of the Lyon encounter - and Stuart McInally - who is named in the 23 for the first time this season following a longer injury lay-off - will all be hoping for game time this Sunday.
Cochrane said: "It's always much harder watching than playing. You want to be out there giving your all to help the team.
"We need to pick ourselves up this week and go in with confidence against London Welsh. Only we can turn it around now.
"We have a change of scene with the different competition this weekend, two good results previously against Bordeaux and Lyon, and we have a big opportunity now to go out and beat London Welsh this weekend."