Also in all competitions:
Asamoah - 3 goals, 5 assists
Lichsteiner - 4 goals, 1 assist
Asamoah missed a month.
Also, I'm literally just going by the first LB/LWB that pops into my head so list is incomplete and I'm so confident Asamoah is tops I won't even edit as I type:
Cole - 1 goal, 4 assists
Kolarov - 3 goals, 1 assist
Clichy - 1 assist
Marcelo - 1 goal (hurt). Last year 3 goals, 8 assists all year.
Coentrao - 1 goal, 1 assist
Alba - 3 goals, 5 assists
Filipe - 2 goals, 2 assists
Alaba - 4 goals, 2 assists (and he takes penalties)
OMG BAINES - 5 goals, 6 assists. Free kick master.
That's enough, whatever.
Conclusion: Asamoah loses the ball sometimes against packed defenses. SELL.
Edit: I forgot Zuniga and Armero. 3 assists combined. Zuniga 4 goals 4 assists in the last THREE YEARS combined.