For multi-million pound businesses, football clubs often seem unusually vulnerable to eccentric owners.

Most are harmless, but some bring their baggage with them.

Nottingham Forest and Olympiakos owner Evangelos Marinakis is firmly one of the latter.

He has recently been cleared of allegations regarding drug trafficking and forming a match-fixing ring. Additionally, he fined his Olympiakos players €400,000 and sent them away, after they fell behind in the Super League title race with four games to go.

It is clear that Marinakis cares a great deal about Olympiakos.

He has invested heavily in the club and has reaped rich rewards, not least seven consecutive league titles.

However, Forest fans would be wise not to wish Marinakis pays them as much attention.

Last season, four Olympiakos managers came and went, despite the side winning the league by six points.

It’s difficult to calculate how many would have gone if they had finished mid-table like Forest this season.

For fans still recovering from having 11 managers in the five years of the Al-Hasawi ownership, this may prove too much.

For now, it seems that the City Ground is being spared the worst of his histrionics.

The sacking of Warburton was rash, but the signing of Karanka is an improvement and a statement of intent.

Combined with the writing off of £40-million debt, the club is in a strong position to start targeting next season's play-offs.

If Forest are to push on, they will need Marinakis to loosen the purse strings and make signings, particularly up front.

The only question is how much will that investment cost?