Reid admits he would rather not be throwing them into the tough life of a relegation battle, but admits they may have to grow up fast.
Milner, who became the Premiership's youngest-ever scorer 11 months ago, and Lennon, 16, impressed from the bench against Arsenal last week after a footballing lesson from the league leaders.
They may feature again tomorrow as they play Premiership newcomers Portsmouth at Fratton Park.
Reid added: "They are both good players but sometimes it is a bit unfair to put that much responsibility on lads at that age.
"They have basically gone out there, worked hard and tried to play football.
"Milner's performances recently have put him in my eye for a starting place.
"He has really come on and the month away on loan at Swindon has done him good physically and helped him grow up."