Biggar starts for the Lions against the Highlanders on Tuesday night having recovered from the head knock he suffered against the Blues last week.
Warburton, the Lions captain, knows that he is playing catch-up on this tour as he strives to overcome an ankle injury.
'I think it's a bit harsh for him to say he's third choice from his point of view, ' said Farrell of Biggar's candid assessment of his own Lions status.
Warburton, who missed the Lions' 12-3 win over the Crusaders, joins a starting 15 which contains only one player - backrower C.J. Stander - who took part in Saturday's match at Christchurch.
Biggar feels he now trails Johnny Sexton and Owen Farrell in the fly-half race - but coach Andy Farrell believes the Ospreys man has been too hard on himself.
In the backs, Teihorangi Walden gets a rare start with Richard Buckman shifting to fullback due to the unavailability of regular fullbacks Ben Smith and Matt Faddes.
Scotland ticked off the first leg with a 34-15 win over Italy in Singapore.
Jonathan Joseph has a chance to claw back some ground on Jonathan Davies in the battle for the 13 shirt in Dunedin, with Farrell praising the England flyer's work in training. There are no plans as yet to call up a replacement, and there are still plenty of back three options.
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Robbie Henshaw, CJ Stander and Jack McGrath warm up.
And while the Lions did not suggest that Hogg would be ruled out for the remainder of the tour, Farrell indicated that they believe they have enough players in their squad to cover for the potential loss.
Warren Gatland leads the Lions in 2017.
Head coach Warren Gatland said: "Sam hadn't had a lot of rugby under his belt so it was important to get him involved for this game". He was happy with many aspects of the Lions' attacking game in Christchurch, especially their use of accurate kicking to get in behind the Crusaders defensive line. "I knew there was going to a better performance because they'd just had that time together".
"It's a nice luxury for the coaches and great competition for us as players". The win was also an endorsement of Gatland's selection which saw the first outing on tour for a lineup of near test-strength.
"I see it as I'm tour captain, and if I've made the Test then that would be a bonus for me, but I've said there are three Tests to get selected for so it's not the be-all and end-all with the first one".
The Crusaders, averaging five tries a game this season, have won 14-straight matches in Super Rugby this season - a club record - but could find no way to break down the Lions' defense as pressure forced them into handling errors.
The wet and dewy surface in the first three games wasn't of much help in this respect and the New Zealand press has picked on the fact that the Lions have only scored two tries in three games while letting through four.
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