"They can't wait to get back on the field", said Farrell.
"He's got all the attributes of a great back-rower". It was really, really hard.
Tadhg Furlong reported some tightness in his hamstring late in the game and is another whose fitness will be monitored across the early part of the week.
"I think that's what we saw at the weekend, and we saw a little bit of what Wayne brings from his Scarlets days", Farrell told reporters in his pre-match press conference at Ireland's training base.
"He's come in, changed a few things".
With such fierce competition between the top table trio, ruling out a Grand Slam seems like an obvious move and with such depth in squad strength Jones' England should, and likely will, come out top of the pile.
Scotland were not too disheartened in defeat, coach Gregor Townsend acknowledging that it was no good dominating swathes of the game but not be able to convert pressure into points.
Despite the contrasting performances in their opening games, Farrell believes Ireland "are in a good place" before Saturday's encounter.
"You love to see that on debut". However, when they last played in the Six Nations Wales romped to 25-7 win.
"It's a transition as well, you've got Farrell coming in".
"It's about getting that mould right, getting the combinations right and that can be a scary team, it really could".
Irish rugby union has swapped the cold analytical administration of New Zealander Joe Schmidt for the famously emotive leadership of Englishman Andy Farrell - father of England captain Owen. I thought the set piece was excellent.
"It was a tough couple of weeks in Japan and hopefully a new man with the reins can change it".
But a return for the 28-year-old now looks unlikely until rounds four or five next month, when Wales take on England at Twickenham then host Scotland.
Ireland skipper Johnny Sexton said the win was paramount. "You'll take that result all day long".
" I will know a lot more [about the future], I guess, when this Six Nations is up", he wrote in Wales Online.
Dan Biggar has hailed Welsh try machine Josh Adams' fantastic record after he started the Guinness Six Nations with a flourish.