I found on Icelandic newspaper that Larus Gudmundsson played for Middlesbrough in 1981-82 (arrived in November). Any corfirm, please?
Here are the Icelandic article. Could you help me with a translation, please?
Title: Larus ekki til Middlesbrough
Larus Gudmundsson, midherji Islandmeistara Vikings, mun ekki fara til enska lidsins Middlesbrough. Larus lek einn leik varalidi Middlesbrough gegn Chesterfield ur 3. deild "mer likudu adstædur vel hja lidinu, en aldrei kom til samnigavirædna. Bobby Murdoch, framkvæmdastjori Middlesbrough, fylgdist ekki med leiknum en hann had mig um ad leika æfingaleik med lidinu i gærkvöldi, en vegna utanadkomandi adstædna tha vard eg ad fara heim til Islands og gat thvi ekki leikid" sagdi Larus Gudmundsson.

No record of him playing league football for any English club. May have had pre season trials at Middlesborough.

I think the article says: he played a match with Middlesbrough reserves against Chesterfield and went home. So it was probably a trial, he was never signed.