Unless you're in a 20 team league with Jason Chimera being the best available option on the wire, don't take this deal.
Actually on second thought, even if you're in a 20 team league with Jason Chimera as the best option you still shouldn't take this deal.
Kovalchuk is a top 10 player in the league. You're return for someone like him needs to be another top 10 player, or top 20 player + a decent kicker.
I'd find it hard to believe that you couldn't acquire either of those players by moving a lesser player.
***Non-Descriptive Thread Titles Killed My Wife and Ate My Children***
10 Team Roto Keeper League (G,A,PPP,SHP,GWG,+/-,PIM, SOG // W,SAVES,GAA,SV%,SO)
Full Keeper w/ Salary Cap [4C/4LW/4RW/6D/2G/5B, 82 gp per roster spot]
C: Crosby, Getzlaf, Ribeiro, Hodgson
LW: Ovechkin, Kovalchuk, Eriksson, Van Riemsdyk, Whitney
RW: Gaborik, Stewart, Read, Selanne, Alfredsson
D: Pietrangelo, Yandle, Edler, Wisniewski, E. Johnson, Whitney, Bieksa, Gardiner
G: Lundqvist, Bryzgalov, Schneider
Yakupov, Silfverberg, Bjugstad, Stone, Atkinson, J. Morrow, Palmieri, B. Smith, J. Bernier