Siddharth Trivedi, whom some may remember as a BG scholarship holder and Academy product, is a slightly-faster-than-medium pacer and frontline seamer for Gujarat. Not much is known about his style of bowling.
Who.....is.....Tejinder Pal Singh? He's a middle-order batsman for Railways, who's also bowled chunks of left-arm spin, but not bowled very often, since that team often has five or six other bowlers. His FC and List-A average are not too impressive, and though he's done decently with the ball, he's not bowled much. His four wickets and century may attract some attention. He's come out from nowhere, almost.
Someone mentioned Amit Bhandari and Amit Mishra, so here goes. Bhandari is not as talented as Zaheer or Nehra, but is a thinking man's bowler. He can use a seaming pitch to good effect, without giving too much width. He doesn't use the bouncer so much, but can bowl a few good yorkers. He had been a standout performer in England, playing for India A, while the not-so-successful youngsters later played for India in many matches. He would suffer on flat pitches, especially ODI's, but the variations in pace as well as the delvieries bowled may help. He's nothing special with the bat or on the field, so his chances of a return are not much.
Amit Mishra hasn't been forgotten, but the selectors are chasing someone younger. It's obvious, he's a lot more accomplished and experienced than Piyush Chawla, so they can't forget him, unless they're interested in Chawla's batting. Mishra was often dubbed as a genuine leg-spinner who can turn the ball a lot more than the famous Anil Kumble. His performance this season (also Bhandari's) was not noteworthy, so the selectors were looking elsewhere.