However, such is Ospreys' strength in that department however that chances were hard to come by - but their loss is very much Scarlets' gain.
Things did not start smoothly at Parc y Scarlets after the 25-year-old ruptured a bicep back in September, meaning his debut was delayed by three months.
But he took all that frustration out on Benetton Treviso upon his return, ploughing over for two tries in a man-of-
the-match performance.
Allen has started every GUINNESS PRO12 game since and also proved Scarlets' star man in Round 14, scoring a try in a slender victory over Edinburgh.
He looks set to go down as one of the signings of the season - and he's quickly won an admirer in Wayne Pivac.
"I didn't know a lot about him before he joined us, but we are really excited by what he has got to offer," said the Scarlets head coach.
"He provides more strength in depth to our options and now he has shown us what he can do."
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Guinness PRO12 Scarlets News
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