McFarlane returns to the U21s after the appointment of Rosenior as new manager this week.
Following the 2-1 defeat at Craven Cottage, McFarlane was asked if Rosenior had any influence on selection or tactics for the night.
McFarlane said: "Liam came in yesterday, probably an hour before we were training. We were having a team meeting to outline what training looked like. He came in before that. He spoke to the players about how excited he is to be at the club, his values, what he wants to bring to the team, what the objectives are.
"He then stepped away, he watched training. I caught up with Liam after training to go through where he'd seen the game plan from the meetings, because he'd watched the meetings back at another point. He saw training, he watched us train. I spoke to him afterwards about what we're going after today. Because he's come in so late, we've already done the prep, so he's left it to us.
"Other than encouraging words, other than being really complimentary about the work that we've done, he's given us free rein to pick the team, to decide the tactics. We're pretty aligned in how we think about football anyway, so if it was completely the other way, maybe it's different.
"He's been really, really respectful and trusting and let us get on with this job before he starts with the group tomorrow."