There is absolutely no guarantee that this transfer will be a success.
However just because a player in his 30's has an injury filled season playing less thsn 20 games doesn't me they can't go on to play 30+ games again.
Gerrard miss a load of games in 2010/2011 and went on to play 30+ the two seasons after that.
Might not happen like that but worth the risk.
He's a player with a LOT of miles on the clock and is now injury prone. He'll play in 20 league games, maximum.