The Norway under-21 internationalist, who is likely to stand out in the SPFL Premiership given he is 6ft 7ins, will move to the Highland club until the end of the season, while a short-term contract has also been agreed with defender Evangelos Oikonomou.
The Greek joined County a year ago before resolving to move on at the end of last season. He will return to the club when the transfer window opens but neither he nor Johansen are expected to feature tomorrow against Inverness Caledonian Thistle as both moves require international clearance.
County supporters will know what to expect from Oikonomou. The arrival of a new goalkeeper holds greater intrigue then; Johansen having joined City from Norwegian minnows Teie IF in 2008 and going on to represent his country up to under-23 level. He also spent time on loan at Scunthorpe United last season, making eight first-team appearances.
"We're close to signing Erik Johansen from Manchester City on loan for the rest of the season," said Derek Adams, the County manager, who also confirmed that defender Mihael Kovacevic has been granted temporary leave from the club as his father has fallen ill. "Johansen is a player who comes to us highly recommended. "We have a good relationship with Manchester City and we'll try to add more players from England over the coming weeks.
"Evangelos Oikonomou, who played for us from January last season, will also join for the rest of the season, all going well. It is just the paperwork we need to sort out with both players. After that, we will still be looking to add further to the squad because we are depleted."
One of those further additions could be Filip Kiss, the Cardiff City midfielder, although discussions on that deal have been complicated by the recent sacking of Malky Mackay. "We are still looking at Filip Kiss but there is a problem as Cardiff City have just lost their manager," added Adams, who had the 23-year-old on trial earlier this season. "It was Malky Mackay we were working on as regards the deal, so that's an issue.
"Attacking-wise, we are looking at various options - we're looking all over the field for players who can help those already here. We're down to 19 players just now, so we're a bit thin on the ground."