WWE Superstar "The Celtic Warrior" Sheamus (@WWESheamus) and UFC fighter "The Notorious" Conor McGregor (@TheNotoriousMMA) have found themselves in a Twitter war.

Sheamus: "ok @SInowLIVE @ufc @TheNotoriousMMA, Conor wins. I don't hit featherweights or shoeshine boys. Mouth off to @BrockLesnar fella, I'm injured."

McGregor: "@WWESheamus, @BrockLesnar fought PURE, phoney. Me and Brock Vs You and any shmuck of your choice. #CelticPhoney #TagTeam @JRsBBQ @WWE @UFC"

Sheamus: "Had bigger dumps after a salad @TheNotoriousMMA lad. U can hold @BrockLesnar's @WWE title while the big boys duke-it-out. Win @ufc title 1st"

McGregor: "@WWESheamus @BrockLesnar @WWE @ufc Careful now scaldy, you will wake up with no teeth and your nose on my mantle. #CelticPhoney #NeverFought"

Sheamus: "Phoney? @TheNotoriousMMA @BrockLesnar @WWE @ufc haha that last lad you 'knocked-out' went down on the breeze of a punch... #NeverConnected"

McGregor: "@WWESheamus @BrockLesnar @WWE 'Never connected' sounds more like your game. You wear ball stranglers and slap mens asses for a living."

Sheamus: "Whereas you talk for a living son & we all know who's ass @TheNotoriousMMA is kissing nightly. #LittleManBigChip"

McGregor: "@WWESheamus I'll whoop you at your own game, then we can toast a whiskey and talk about true fighting. Always remember #UFCAsRealAsItGets"

Sheamus: "Whiskey in Dublin this Christmas @TheNotoriousMMA. Shirts on the deck, back-to-back, and we'll fight everyone. #TraditionalIrishChristmas"