Personally I'll be a little disappointed if we haven't yet sent a scout to watch Cenk Tosun. Could be just the type of striker we need,
https://youtu.be/1n_SaJPqqUg
Leonardo Ulloa also arrived in January, but I wouldn't have thought that Krul's loan would have been turned into a transfer unless there was a considerable chance that it may be needed. Club has recent history of bringing in forwards on loan in that window also (Akpom, Wilson, Ledesma, Obika...