Seddon played 200+ games in his career, including 30 odd in the season before joining us, so I'm not sure we can call him injury prone. Definitely not in the mould of Sam Nicholson, who is a genuine perma crock. Seddon had 2 injuries with us, and missed games at the start of the season when wilson kept his place. The big injury he had last season was the ankle one that put him out for months, that i think happened in a game. It would come down to how hard those are to recover from long term.
I like him, and he's a better footballer than the other options there, he also gives us a good fdw options on the left of defence, whether LB, LWB, or LCB, so I'd like to keep him, especially since decent left bqcks dont grow on trees, but he hasn't played enough for me to be turning up at FP with a pitch fork if he wasn't extended.