Personally I'd want Dembele against the gooners. His ball retention is second to none and they'll try and press us, plus he tends to play better against better opposition. Therefore play him on Monday and rest him on Thursday if we need to rotate.
Lloris
Walker Alderweireld Vertonghen Rose
Lamela Mason Alli
Eriksen Chadli
Kane
As we're getting nearer chrimbo and I'm feeling festive thought would go with Christmas tree formation
but Chadli is still injured and I don't know why you left Dier out, so here's your updated "tree":
lloris
walker toby jan rose
dier mason alli
lamela eriksen
kane
how's that?